The first pic is a 1966. I don't recall what the other truck was. They both have the down under exhaust.Interesting, . . . it looks as if your replacement engine has a "D" turbo, but the exhaust is a N/A type (skinny stack and muffler under the cab) .
Mine was originally a N/A also.
Is your data plate there? Is it a '66 Kaiser-Jeep model?
Here is an illustration of the spare tire carrier.
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