I like a fast revving engine and I plan on running exhaust manifolds so anything larger would have been a waste. Basic plan is about 10-1 compression with 440 Source heads, roller rockers, solid roller cam, we have not chose the cam yet. DP4B intake, AVS2 800 carb, TTI 2-1/2 full exhaust.Just found a 70 F383HP block to start mine as well. What made you choose that kit? If you have a build plan I would like to follow it and see what other parts you choose. Ths is my first build.