Another 727 question

I know where there's a small block 727 out of a ~63 or 64 pick up. If this trans was original to the truck, what differences would there be in a 727 of that vintage compared to the later 70s and newer ones that I'm more familiar with?
What would be interchangeable between such an early one and the later ones? Were all early versions cable shift and ball + trunnion style?