get short block hydro tested and magnafluxed. Get 331 stroker rotating assembly for $2.5k. Get installed in short block if you can't do the work yourself. Get blue-printed and balanced. Put stage III N/A vt cams in heads, and put heads on shortblock yourself. Put engine back in car yourself. You can do all this under $5k and have a bulletproof engine. with a power adder you can make an easy 600rwhp+ depending on your fuel setup.