Finally got around to looking at this truck last weekend, as I was driving through. I'm glad I didn't make a special trip.
The "original engine" turned out to be a 250 (not even a 292). The front motor mounts were welded to the base of the block.
The "5 speed" turned out to be a SM 420. Well heck, I guess reverse is a speed!
It was an IRWIPI, sunk in the soil with rims rotting away, back end loaded full of junk, and various bits and pieces removed over time.
