I have come to the conclusion that when I start to build up my engine in the next moth or so, I want to use fuel injection.  I have been researching various options,  TPI, TBI, Aftermarket units like Accel and Holley Commander series.  Right now I am leaning towards one of the aftermarket units for two reasons.  I want a multipoint system since from what I have read they are superior, and from a cosmetic standpoint, I want something with an aircleaner sitting on to of it, since it looks like it belongs a little better. 

The Holley Commander system is supposed to be the cat's meow. I've seen several articles on it in the Corvette mags, and they've all had high praise for it.

The single plane intake works with the TBI type set-ups because you're no longer depending on a vacuum signal to work the fuel flow, as you do with a carb. Thus, the single plane is used for the more direct air/fuel path to the intake ports/valves. I'm sure a dual-plane would work too, but...why would anyone want to do that? Just too restrictive, in the long run.
All of the atricles I've seen did not say they needed to change the hood, or scoop it for clearance. I guess it would depend on the air cleaner assy...same as a carb set-up.

I have the Edelbrock Pro-Flo RPM EFI installed on one of my Avanti's and so far It's been awesome.  It doesn't have the "WOW" factor systems like TPI have since it looks like a carburetor setup, but it runs fantastic.  About the only thing that gives it away is the fuel rails.  In fact, at a car meet last year a guy asked me if it was carbureted and fuel injected! 

As far as clearance goes, the air cleaner I wanted had to have some custom modifications done top clear the hood, but there were other options if that didn't work.  The throttle body is lower than a carburetor, but the intake itself is a higher rise design than the oe intake was, so overall height seemed to be a bit more, but the air cleaner I wanted may have made the difference.

I've heard good things about the Holley system but the speed shop I know and trust believes in the Edelbrock, and I already like Edelbrock products.  I had considered the GM Performance Ramjet system, but they said that GM had been having problems in service with it so they couldn't recommend it at that time, which was nearly two years ago.  Maybe the problems have been worked out now.

Whatever you do, I'm sure you'll never want to go back to carburetors again.

I have been researching aftermarket EFIs among the local non-Corvette car people, and, besides the two mentioned above,  there seems to be a lot of them who like the Accel DFI system.  Others seem to like the factory tuned-port system as modified by TPIS in Chaska, MN.  I'm afraid I'm not far enough along on any project to have personal experience.

Edelbrock's fuel injection comes with a EFI calibration module which is inside the corkpit. You don't need a laptop to make adjustments. You can set up the module for three different driving conditions. They supply everything that you need for the coversion. The minifold is an airgap, which is higher. the throttle body is very short in height compared to a carburator. the price is a bit expensive. for pictures and facts go to:   http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D3507&N  FOR VORTEC HEADS. If you want info for standard style heads, go to: http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D3500&Na corvette440hp2008-02-13 13:33:18

I have the Holley Commander system and I love it.  It was great because I drove my new motor around with a carb on it for a while before I swapped it for the MPFI, so I got to really feel the difference between the two and it was very noticeable.  My system wouldn't fit under the stock hood, but I was switching to the L88 hood anyway.  I've heard good things about the Accel systems as well.

Thanks for the info, I read through the install instructions for the edelbrock unit (you can get them from the edelbrock website) , and one thing I noticed is that they insist on using the rubber fuel line supplied with the kit.  My car has a brand new stainless fuel line in it that I would probably cut the ends of to put some fittings on. 

I think Edelbrock wants customers to use their supplied fuel line due to it using a pressurized fuel system and they can't know what other type of fuel line an installer might use.  If someone uses a fuel line not rated to be pressurized it's trouble waiting to happen.  Eldelbrock supplying and specifying the use of their hose gives them cover...for both reliability and liability.

Gunslinger is correct about the fuel line stuff. I ran my lines with the Russell stainless hose. The key is to have a 3/8" supply and also a 3/8" return line. Russel has full flow openings in their fittings. By the way if you don't already know this: Edelbrock owns Russell. 

  I am running an Edelbrock 3550 on my '69 big block.  It runs very nice.  The first problem with it is, it does not seem to want to keep the tune.  I have had to re-tune it now twice in as many years.  The second problem was I had to fabricate a bracket to hold my existing accelerator cable (you may not have to do this).  Also I could not get it to fit under my stock hood.  I am using an L88 hood with an Edelbrock triangle air cleaner.  The install was very easy.  I used their supplied fuel line as my supply and my existing factory line as a return.