87-93 Mustang uses a smog pump, air conditioning, and junk power steering pump. It also puts the fan very near the radiator. It also puts the water pump inlet on the wrong side of the radiator.
I used to recommend doing the A/C delete, remove smog pump, and install the 1G alternator to retain the Mustang serpentine. But I don't like the distance between the fan and radiator.
If you already have a Saginaw power steering pump, and a good alternator, I just recommend running V-belts.
Otherwise, go straight to Explorer front dress.
The mustang stuff is just a waste of effort to me.