354 or 392? Hemi? Questions?

Guess I'll have to see exactly what he has.... I hope it's a 330 or 341. And a inch narrower would help alot. Is there anyway to easily get 350 hp 400 torque from one? I would hate to say ya it's got a hemi but it can't run... Or take someone for a ride just for them to be like should of put a 340...