And you left out the starting point, the many different intake manifolds, which dictate pretty much all of the rest.
All the fuel pump stands, 34-48 are the same height. There are differences, but they all mount the pump the same height from their base...Your 34 intake requires the use of the long push rod [8 7/8"]. Any fuel pump 34-48 will mount to any 34-48 fuel pump mount.