When I went to rebuilt my 440 upon tear down the engine was worn out. Block needed to be bored and the crank had been previously turned and was gone. Anyway I ended up buying a 512 stroker kit and a set of stealth heads from 440 Source. The machine shop did all machine work on block, disassembled & reassembled the stealth heads checking everything out. They then assembled the entire short block using stroker kit installing cam bearings, cam and freeze plugs, etc. I put the heads, push rods and intake on and my build ended up being about $5300 which included a new oil pan and valve covers.