I'm getting ready to start my first serious project. I'm going to have my engine built for boost. Here's the issue, I can get a new MMR 950 5.0 stroker short block with a billet oil pump, UPR head stud kit, main bolt kit and side bolt kit, a windage tray and upgraded head gaskets made for high boost. All that balanced and assembled with a warranty. Or there is a local guy with a built Mach 1 long block with eagle rods, pistons and crank in a 5.0 stroker set up, with fully ported heads and intake. This guy wants to return his car to stock and sell it. Issue is, the guy started his engine on a cold morning and revved it way high and dropped 2 intake valves. The guy that's going to be building the engine for me did the clean up work on this other one. If this guy wants to sell me his long block for mine plus a couple thousand, is it worth the risk of no warranty?