built 340

Wow, can't wait for an answer huh? Not even 40 minutes. Yikes!

400 HP at best IMO

Is it 10-1 or 11-1 comp ratio?

The starter, hardened valve "seats" fuel pump & crank material have nothing to do with making HP. Just a FYI. ;)

Glass packs, if they neck down in the inside, rob HP. Better parts are required. Flex fan is not helping. Better off with the factory viscous fan dyno proven to make more power over flex fans.

I think a bowl ported set of heads would do you right.