Alternators-adjust my thinking

This is a confusing area, really appreciate everyones input. This all started because I thought I would pick up a few more amps from an alternator that could have been originally installed. Still, the #2098830 on it now I can't track down. Am assuming it's a 37A of unknown year. Part is supposed to be #2642537 for '68 v8, even my 383 no A/C, still a 37A.