To get 400 HP out of that 318, you are going to have to up your compression.
Get a set of closed chamber heads(low cc),thin head gaskets, .022 range.
A good cam,480-500 range.
Performer style intake.
Headers.
A turbo or blower set up will get you there but it will be at higher price.

Last edited by moparborn; 01/15/19 03:34 PM.