Hi Guys Butch here from Canada--I am a novice at this I have a couple of questions---I am doing a head swap on my all original 1975 302 engine. I have accomplished a 2 bbl carb & manifold swap to a matching set of Edelbrock aluminum 4 bbl intake. Now I am about to do a head swap to a set of gt40p heads. The heads have been planed 12 thou to make them true--I am installing a set of headers new lifters and a new 2,5 inch exhaust what kind of hp and compression increase in general terms will I be looking at after all is complete--thanks
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