There's a special tool available at most auto parts stores that removes and installs the P/S pump pulley. It's two semi-circular pieces that grab the little snout on the pulley and the business end of the puller. There's a metal collar that goes around them to hold them in place while you crank on the puller.
The Ford pump is indeed noisier than most. I went through this with mine and I put a new Ford-style pump back on the car. I didn't know about the Saginaw pump option or I would have at least looked at it. It took a while for the new pump to quiet down. I think air had the most to do with it, but I just about wore ever other steering component out cranking the wheel back and forth to work the air out of the system. It's still noisier than any other vehicle we have but it's quieter than the old pump.
I think the only bracket mods you';d have to do would be shaving the fins around the bolt holes if they're there and clearancing the bracket at the filler neck. No sweat.
The low pressure return line is a no-brainer, but the high pressure side might be tricky. On the hose, the end is bent to reach the Ford pump. The high pressure port on the Saginaw is at a funky angle. You might be able to tweak the metal tubing on the end of the hose so it sits right.