I have a military rebuilt engine in the can in the back yard.... I'll have to post a few photos of what the engine looked like when the can was opened. Does the phrase "boat anchor" strike a bell?? Fozen solid, and in such shape that I just picked things like the clutch, oil pump, water pump, ect off it and have the rest in the back of the M817 with some other scrap headed for processor next week...
At best, I'd consider it a rebuildable core (if it looked ok after taking the cover off the can) due to the time in storage and the changes in such things as gas formulations that would want you to swap out the diapharm in the fuel pump, etc.
Good luck.