Which heads?

Actually, I'm agreeing with you, ratrod. Low compression cars that high flow will out run high compression cars that flow low. That is why I'm leaning toward the 308's. I just want to be sure I won't have to always hit 5500 rpm's to see the real benefits while having my low end torque be flattened, and it don't take much to flatten a highway geared, factory torque converter 318. I posted this question because I want the right combination for this particular car.