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This next step will bring low end power and adjustability. What you need is to lean the mixture.
When you have a large cam in your engine it wont's to run at about 1200 RPMs it's running on the main circut in the carb. the trick is to get it back on the idol circut.
Look inside your carb at the primary butterflys if there open more than .040 there open to far.
If you have ever looked at the primary butterflys on a holley carb that came factory on a big block you will see a hole drilled in each butterfly, this is to allow more air, to lean the mixture.
For the hole location you'll have to look in one of the holley books unless someone has a piture of it ( come on guys help me out here ) you with a small drill bit 32ND of an inch and inlarge little by little untill you can turn your idol speed down to around 700 to 800 RPMs and your idol mixture screws will make your engine die when turned all the way in and proper mixture at 1 1/4 turns out.
My truck had a 538 lift 308 duration comp cam passed emissions with a 1.28 max allowed 4.00, idoled at 700 RPMs and would pull a trailer up hill at idol and never got to hot. Hope this helps. Matt
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