Im getting ready to try my 2x4 set up on my 66 Dart with a 408 engine. I will be using a pair of edelbrock heads, 1.5 rockers, 590 lift on both valves, compression should be right around 11.5-1. I am using a edelbrock tunnel ram with 2, 600 vacuum holleys. Factory jets in the primarys are 65s. I...