Updating alternator - have a few questions

I agree w/ AJ. As long as the alternator keeps your battery charged, it is doing its job. A round-back works fine in my 65 Newport w/ EFI and electronic ignition. Electric radiator fans are the main load that requires more. Those began in FWD Mopars like my 82 Aries, which had the 70's square-back alternator. It vaporized the diodes every year, almost like clockwork. An auto electric shop told me that was typical. Always, the positive 3 diodes that aren't bolted to the case. I started band-sawing cooling fins into their rail, which made them last 2 years. I suspect the sideways orientation gave less airflow thru the alternator, since A's that use the square-back don't report such problems.