lots of money
If you are going to make 400 ponys with a 355 ci SBC then you had better get ready to spend lots of money. Get you a copy of Desktop Dyno or PM me your e-mail and I will send it to you and put your motor into it to see what you have. It takes Good Heads,
good intake manifold and Carb., much bigger cam than stock
and lots of time to put it together right the first time.