Get a set of zero deck pistons, flat top w/ valve reliefs.
440 source stealth heads.
MP .528 solid cam.
Hp exhaust manifolds.
Edelbrock performer RPM intake manifold.
Would be able to be done on your budget. In a 440 this combo will do about 500hp. In a 383 it'll want to wind higher but it should pass your hp goal.
The only zero deck 383 with valve reliefs for a 383 is a custom piston , semi custom in a diamond with the pin moved to get zero AFTER you have the block squared, 383 piston choice is really bad.
