Gents; After 2 years of gathering dust I finally completed freshening up my 383 Chevy engine that's in my 1980 4 speed Camaro. I had the home ported 993 heads gone thru with new seals by a local machine shop. I installed zero gap (cheap "claimer" style) rings and a XE268 cam. The engine makes 195 to 200 lbs. of cylinder cylinder which is more than it did before (170-175). I am running cheap cast flat top pistons (again "claimer" parts) and 1 5/8" headers. I am at a loss as to the higher cylinder pressure other than the XE cam's ability to trap more cylinder pressure because of it's fast acting lobes...Harold Brookshire apparently, really does know what he's doing. The best I've seen for my combo on the net is maybe 320 horsepower and 390 lbs of torque. Anyway, that auto runs like a scalded dog and will break loose and go sideways if I'm not careful shifting gears...heck my wife makes me sleep on the sofa if I open it up with her in it....300 to 320 horsepower would not do that! Am I getting old and becoming overly easily impressed or do I have more horsepower than the desktop dyno's describe??