[BossHogg69]

I agree with Marv - 'everyone' (esp. online) has a 400hp 350 or a 500hp 383 these days... But that's another matter altogether. It seems like you are set on getting some heads, but what castings are on the engine now? Having that info would be a good start, so would knowing what rear gears you have. You could always start with the basic E'brock manifold, an HEI and long tube headers/exhaust. This and a decent cam and some valvesprings would eat up a lot of that $1500, but may not meet that 350hp goal, depending on your current heads and compression ratio.

As others here can vouch for this, anytime you do something like this a lot of little stuff will pop up along the way that will eat into your budget, so be prepared.