Originally Posted by F-BIRD'88
I not sure but I think the 4% general rule for compression ratio/power difference refers to peak hp. Torque at the low end can be effected more.
Take it as a general rule of thumb.
Even at that if you were limited to running economical 87 octane gas (and the limited cr, you'd still have a pretty good motor. Mostly because the cam is fairly mild as cams go and the heads are pretty good. Should work well.
FLAT TOP and 75CC AFR is the best torque combo... in a 355 makes for a nice easy 9.5:1 which is still 87 frendly if you chose a 260-274 duration cam and keep the cranking compression numbers around 175-180
a 12CC dish and 75CC is less than what you want.. its at best 8.75:1 with conventional gaskets to get 9.1 you will need a shim style headgasket...