I swapped the stock type alternator for a one wire 100amp Powermaster.
Ditched the external voltage regulator and the remnants of the PO's alarm system, which included a Bosch style 30/40 relay, a 'hood open' relay, a hazard light relay, and a sorry excuse for the alarm's main harness.
At one point, me and a buddy of mine had no idea what we were doing when we had the Mustang's main harness draped over the front of the car, just one thing lead to another, and in the same fashion it got back together.
The only thing I had to do before hand was to remove the serpatine pulley for a v-belt pulley that was included.
And I went to a local super-electronic supply store for 8 gauge wire and terminals for the '1 wire' alternator feed. they were nice enough to crimp the terminals on for me since I don't have the crimpers for large gauge wires.