If you look at the service bulletin, and the parts catalog, you see that E body got a 3438 series 50 amp 72 alt. Only Fleet got 3656 series 60amp. Not an expert on this, but the AC cars would have the dual pulley and 50 amp. From that bulletin a big block AC E body is getting a production 3438811 with 3" Dual pulley, and the service alternator was the 3438809 (9 could be typo and should be 6). But of course the consensus correct hemi production line alternator part number is not listed anywhere either. But if you examine the part number pulley combo, you do realize it needed it's own part number because it was the only 37amp alternator with the 3" dual pulley.

Who ever was responsible for alternator numbers at Chrysler was either eccentric, or a newbie. Or maybe they changed part numbers depending on the vendor. From the bulletin you could see that the service alt was a 50 amp even for a 37 or 41 amp application.

https://www.hamtramck-historical.com/images/TSBs/1971/71-8-14_page1.jpg