I suspect I have same alternator problem though it may also be the external TWC “booster” that fails, with my AC5B 12-10 35A CAV alternator.
I have been looking here and there for a replacement part without success as of today. I may consider a 50 – 60A one.
I’ll have to collect new information aboard (revolving direction, pulley shaft size and the like) before deciding for some prestolite compatible unit.
In Cat A Log issue number 61 page 20 there is a recommendation to look after AC5B123 on DJF Auto web site.