[69 Mach I]

The Paxton Novi 1200 installation instructions say that you have to use stock or lower than stock compression for carburated SBFs. My 69 Mach I was an M code 351W, which means it was originally running 10.7:1 CR on iron heads. I swapped these out for alum heads. Now the rule of thumb is that you can run 1 point higher CR on alum heads than normal because the heat dissipates so fast. This means I comfortably could have upped to 11.7:1 but all I did was up my CR by .3. And is there any real difference between 10.7 and 11? Theoretically, the alum heads should allow me to bolt on that Paxton and run 5 lbs of boost without courting disaster. I keep tryign to call Paxton but can never get through. They say they will call you back but I am 9 hours ahead of them and I don't want them to call at 2 in the morning for me when it is 5 pm for them.