Fww, if you can get away with a 65 amp alternator, the Pinto is reasonable in cost, easy to find and not overly large.

An external regulator is required and when they're in a cool place - under dash or under seat - they last a long time.

Less than $50. invested in both alt and reg including tax.

They come with a single groove pulley, but it's easy to convert to a double groove.
Far as I know, any Ford double groove pulley works on the Pinto alternator.

Wiring is easy as well.