Here's my "I'm a big dummy" question for the day (or the hour, depending upon how things are going ):

Are there any functional differences between a "round back" alternator for a '69-earlier and '70-later? Seems like I've seen stuff re: differences in the charging systems (voltage regulators and???) for those year ranges, yet I see Mancini offers a couple of "repro round-back" alternators that are listed to cover all applications prior to 1975.