318 build up

if you have good heads, a dual plane, 600 cfm like you said, i would make sure good ignition and enough fuel. get a custom cam ground. do the math with the ratios and weights, and get a cam thats going to perform the way you intend to drive the car. if your not going to race and rev to high rpms you may want something thats going to benefit the car at lower rpms and help out with cruising speeds.