Thanks for the replies, here's what I found if anyone is in a similar situation:
Wilson 90-15-6424 160 amp alternator
compatible alternators listed on the Wilson site:
Delco 24Si or 24Si HP
Bosch E8
I had it tested at O'Reilly and it failed, has an audible bad bearing, and they wanted $245 for a re-manufactured one with $60 core deposit. I found a compatible one on Amazon for $95
The bracket where the alternator broke off on mine, so I'll be doing some welding too