We are running a sbc 350 with 76cc heads, stock block, rhoads lifters with 4 valve relief pistons, I have a set of the same heads cut to 72cc, with the 76cc heads we have 150 lbs of compression, is it worth swaping the heads to the 72cc and how much gain in compression would we get? Other cars in our class have 180-190 compression and they claim they are all stock, just want to try something to keep up with the other cars.