I have always understood that Chev pumps mounted on the left of the transmission and Ford on the right, both pointing to the rear. I haven't tried to see if the gears would mesh correctly if pumps are swapped from side to side.
In the Canadian context, and for Chev cab 13, there is only one threaded plug / opening in the floor to reach the pump's actuator shaft. Again, I haven't run a trial to see if all pumps would line up.
I believe all Chevs used very similar transmission mounts. At least the C8A, C15A and C30 up. I'm not as sure about the 2 wheel drive C8 and C15 but would guess they used similar bellhousing and thus mounts so would all suffer similar clearance issues. The 270" engines were mounted differently, whether in C60X or armoured vehicles but locations were similar.
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