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Well, I would guess it is a 52 because of the motor mounts having the holes for the overhead 6.
So.. did we ever figure out what year it is?
Good eye!
But the later 51s had quite a few things on them that weren't actually used until 52.
This is the first part that reflects something 52.
And, what year is it? It's a 52 truck that's a 51 model. Every part on it so far (this being the first possible exception) being from the 51 model year.