I know it is answered somewhere on here but I am A.d.d and could not find it. I have a 383 with the double hump syndrome. The compression should come out to 9.2 to 1. I will be running a 700r4 and it will be in front of 3.08 gears. I have the 454 tb and performer. It will mainly be a driver in a 71. Thanks for the help!