I have a 340 with kb 243 pistons and i am using rhs heads 1.92 intake. My question is the kb website has 64 cc heads at 9.4-1 and mancini has the 243 pistons at 9.5-1 with 72 cc heads. SO what compression would I really have with 62 cc heads? I have holley 3310 edelbrock airgap. So would the...