A cosmetic benefit of using any internal regulated alternator is you can now remove the voltage regulator with its bundle of wires and clean up the engine bay. This is a GM
3 wire alt I have used for several years and shows the less cluttered inner fender without the original 57 regulator. A double pulley let me retain the original generator mount and align the belt. When I changed to the 3 wire alt, it was not easy to get the gen light to work properly with a 1 wire system, so the new voltage sensor mentioned may solve that problem.
Not for everyone, but its what worked for me.