Surprise! Now what...

All good input... but I think the OP has to define his idea of 'budget'.
Its gonna cost about 2,000ish if he assembles himself and had prices for machine work as I do here to build a 375-400 hp motor. Talking kb pistons or sealed power, .500 lift cam, stock heads rebuilt w/valves/springs.

Throw 400-600 more for port work and bench time.