I've been playing with a friends motor for the past couple days and just can't get this thing to run correctly. It’s a Chevy 350 in an 81 Camaro, approx. 11:1 compression, Dart iron angle-plug heads w/2.02/1.60 valves, a Comp 294 solid cam, Edelbrock 750cfm carb on an RPM intake, headers with 2.5” dual exhaust and flowmaster mufflers. Problem is the thing just has no power at all (I mean an escort will dust it), will barely idle, and almost instantly fouls plugs. I’ve gone through the ignition (GM HEI: changed coil & module), tried several different plug types with varying gaps, tried 5 different carburetors, completely drained the tank and filled with 112 octane, checked filters/gaskets, etc… checked rocker adjustment 3 times, checked cam timing 3 times, and checked compression. Everything came up fine. The only thing I haven’t done is put a vacuum gauge on it because mine broke and I’ve been waiting for Fed-Ex to bring my new one, although I have tried putting a 3.5 power valve in the Holley 750 I tried and that didn’t work either. It seems like a giant vacuum leak to me but I can’t find anything yet. The heads are in excellent shape so I don’t suspect them. I figured I’d post and see what everyone says while I wait for my vacuum gauge. Thanks!