So Im looking to rebuild my 305 and get a little more performance out of it. WOuld I lose something by using 210cc heads (for like 350-400sb's) instead of something smaller. I dont see why all i can see gaining is more flow with the bigger valves. ANd i figure if i got more high comp pistons i would end up with near stock compression and great flowing heads/intake/exhaust. Am i missing something?