58 d100

33IMP said

.....,so then, in theory, a T10 or super T10 might bolt up?
Frankly, if that truck has the rear gear in it that I would expect, I'd look for a way to put a T5 overdrive five speed in it.

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I think so. Ford, Mopar and others may have used the same bellhousing bolt pattern. I have this T85 with an R11 overdrive out of a '59 Fairlane Galaxie and it actually has a 23-spline input. I think it was a few years after this that Mopar started using a 23-spline input.