I'm getting ready to build a 'stock' class motor for one of my trucks (mud truck). What they use to determine 'stock' or 'modified' is the engine vacuum and at what RPM it is drawn at and the type of fuel it runs on.

Basically I want to get 400hp (or more) out of a 350 while still drawing 15 inches of vacuum at or below 1000 RPM on pump gas (91). I know you can get 400hp from a 350 just from looking at it right, the vacuum requirement is the only thing i'm not sure about.

Justin