It was delivered and unloaded last night.
I will start with repairing the existing engine because it will be very cheap. The crank needs to be ground from a spun bearing, but the remainder of the engine looks fine.
I have extra pistons, extra connecting rods, and a couple of spare jugs.
I think I can rebuild this for a under $400. Some machine shop time, rings, bearings and a seal kit should do it.