Chilly is correct. The problem is that you have too much exhaust restriction and the Comp Cam is bigger and is ground on a narrower centerline, which all adds up to more overlap. Overlap works great to boost volumetric efficiency on an engine with open long tube headers, but with restrictive exhaust it simply exposes the intake tract to the backpressure that's present in the exhaust system and results in intake reversion which kills power on both ends of the power band. If the exhaust system isn't big, free flowing, and thoroughly optimised, usually a cam with wide lobe seperation angles and run with 4 to 6 degrees of advance will perform much better. It's the same reason that many people have found out the hard way that going from the stock 116 lobe seperation cam to a hotter 110 or 112 degree l/s cam an otherwise stock 5.0 with stock exhaust will only slow the car down. Try playing with numbers a bit on your program. Put your intake lobe centerline at 108 - 110 degrees and your exhaust at 120 - 124 degrees and look at your results. It'll give you a good idea what kind of cam you should look for to match your combination. You could also throw the specs for Ersons M/P1 grind, part no. E211011 The specs are 208 - 214 intake and exhaust duration @.050 and .28 and .299 intake and exhaust lobe lift, with 108 intake centerline and 120 exhaust centerline. I'm thinking your engine should like it.
