Well, I have this engine which is original 1965 casting and was rebuilt by a service manager of the local Chrysler dealership to do some racing but the heads he put on it were too big a valve for that little engine so he took the heads off and stored the engine, minus heads and cam , under his workbench it has forged crank, high-performance connecting rods and TRW pistons already installed in an engine block that hasn’t seen much wear since it’s been rebuilt last.. as a matter fact he told me the other day there probably was not even 10 hours of running time on that engine..