I'm trying to find a 14" offset  dropbase air cleaner base for my '75. I need about a 1.25" to 1.5" drop as I'm using a Performer RPM intake under my stock hood. I need the offset to clear the HEI. I currently have a standard 1.25" dropbase that clears the hood OK; it rubs against the HEI though. I found this one: http://www.allstarperformance.com/product.htm?prod=1385 which says it fits Edelbrock carbs but not ones with a choke. Other ones I have found don't have much of a drop and I'm afraid won't clear the hood. I can always go with a 10" round (which I don't really wan)t or one of those triangular ones (again, which I don't really want). Just wondering if anyone had solved this problem. You'd think someone would make one.

Greg, here's what I did.  I copied this from a PM I sent to another member that inquired about my air cleaner:

Greg I had the same problem. I was able to use an extension ring on top of the carb. I still had to rig it so it would fit. I have to make sure that the cover is screwed in tightly or the bow tie screw I have rubs the hood.

Thanks Dave and Dave (lol). Some food for thought there. I may buy the base I mentioned and try to modify it if needed. It isn't very expensive if it is a complete failure. Nothing ventured, nothing gained they say.

That carb not only has the choke plate removed, it also is missing the secondary air valve, which is similar to a choke plate, but is weighted to stay closed until the velocity of air rushing over it opens it up. That's one of the main differences between the  Carter AFB(Aluminuminum Four Barrel) carb and the Carter AVS(Air Valve Secondary).

That's a neat off-set cleaner base! Just be careful that you don't wind up with the air cleaner top sitting right on the top of the choke housing of the carb. You need a bit of space between the top and the carb for air to be able to get into the carb. Another thing, wih the air cleaner moved forward, the front edge of it is going to be even closer to the bottom side of the hood. With the '75, that means you should have the cowl induction hood, so be sure to check and see if it will all sit where it needs to be, and still be able to close the hood.

Will do Joel. This base has .25" more drop than my current one so I think hood clearance will be OK. If it doesn't work I'm out $25 + shipping. Might be able to modify it if needed as it's aluminum.

I read that 3 times and still can't figure out what you did.  Glad it worked...what ever you did. 

Gary, if you look at Dave's pic in his sig, you'll see the filter he described. Basically, it is the original base, and top, but the base has been cut down on the outer circumference to to diameter of the filter itself. The original base is/was huge, since the early '76 cars still had the cowl induction hood/air cleaner assembly. All he did was trim the base down to a smaller diameter, and use a shorter filter element.

Here's what it would have looked like originally...

Gary: I cut out the bottom of my original big old GM closed element housing and used it as the drop base for a 12" air filter element.  What I ended up with was just a 12" diameter plate that sits on the carb air horn and drops the element down an inch or two.  On top of the element I used a stock-style air cleaner lid from a '73-'75.  ('76 and later used a closed element system - my original lid was too big).