PowerSteering
What I've found about the different brand pumps (Federal, TRW, Saginaw) is that the Saginaw seems to have less problems with leaks, and if you get the bolt-on pulley version, it's much easier to swap pulleys. the problem with swapping them to another brand, is the brackets, hoses, and pulleys don't swap over, so, you need to get a whole changeover. There's also the return hose difference in the '66 and older models if you want to use the later Saginaw pump. You then need the later steering gear hose fitting on the control valve.