i wasn't sure if there would be a difference because it was a higher performance 427 intake or not. Thanks for the feedback. And you're right, i have absolutely no smog controls, but little does it matter in minnesota!!!

Go to Holley.com for assistance in tuning your carb. It takes time, but you have to balance your primary jets with the power valve, and the accelorator pump system. If your jets are too lean, you will have hesitation. If your accelorator discharge nozzles are too small, you will have hestitation. If the accelorator pump or pump cam are not adjusted properly, you will have hesitation. Also, check the vaccum of your engine at idle. Large profile cams will reduce vaccum. When your vaccum drops, the power valve opens. This needs to be sized for the engine vaccum. If it is not opening, it can cause a lean condition. If it opens too soon, it will make the engine run rich at idle. Once you get everything tuned to the cam shaft, you should not have to touch the carb again. I run a 750 vaccum secondary. Once I get it tuned for my engine, I don't touch it. I have used Holleys on many engines. Holleys allow greater tunability (if that's a word) over some other carbs. They can be frustating due to this benefit. As someone stated earlier, a copy of your intake is still produced by Holley. It is a dual plane for idle to 7200 rpm range. You may check the power range of the cam shaft. You may have to install a higher stall torque converter to take full advantage of the cam shaft profile. Many people install too large of a cam shaft for the steet, but we love the way they sound!!
Good Luck & take your time,

Hey sstanford, great response!

I'm thinking that you are probably right on, I've underestimated the amount of tuning that my new Holley is going to require to maximize performance and driveability. I'm going to tear down the old Holley that ran pretty well and I'm going to email Holley all of my specs including the vacumn readings.

I think the cam is already pretty well matched to the intake. On top of that I have the larger valves, headers, solid lifters, and hardened valve train parts that should allow me to take advantage of the high rpm horsepower. It's just too bad I don't drive there most of the time!

By the way, my stall point is completely dependent on my left foot!!!

Thanks everyone for the input!