Pulled the engine from the truck today and learned some things. The block casting code is 52. The head code is for 41 to 48 so maybe original head but the block was replaced at some point.
Everything actually looked way better than I expected, if I would have tried turning it over from the flywheel I bet it would have gone. Once I put a prybar on it out of the truck it got past the rough spot and easily spun over by hand. The rod bearings look really good. There is one decent patch of rust in the one bore but from what I was imagining it to be this is much better condition. I bet this would have ran once I got that to pop loose of the rust spot.
