You are limited by the TB heads. If you can get everything you need to use Vortec heads I would go that route. I think 380Hp on the dyno is pushing it. Without the dyno sheet to prove it he's just talking smack. I have a stock '94 Silverado, 350 TBI, I'm guessing it has 250Hp and pretty much is done at 4000 RPM, I know a cam will not add 130HP. Just my 2 cents.

Keith