What I learned at Pettis Performance years ago was that going from say 9.5 to 11.5 comp. made way more power than going from 12.1 to 14.1 fwiw. On another note however, I have a customer w/a 3450 lb Chevelle on 93 pump gas w/a 572 at 11.7 comp. that went a best of 8.84 at 151 w/a 2-circuit cast 1250 Dommy..........