ever checked the idle output on one of these alternators? Worst of any alternator I've ever seen.
Crappy type with low idle output:
Delco design found on Police and H/D vehicles. I personally have never seen one of these fail (where the other type I have seen)
other than originality, I see NO advantage to keeping the top type of alternator. I even have the 65 amp 80's version and it can barely keep up with the engine and the headlights on at the same time.