I have that bracket on a 383 and used this alternator. It's a70 amp alternator, but there should be a 90 amp one that you could use.

FYI, this is a nice looking alt. bracket, but I ended up making my own timing pointer that I installed in the slot on the bracket that was intended for a crank trigger sensor. If I did it over again, I'd look for other options.

https://www.autozone.com/batteries-...ufactured-alternator-14903/5752_480818_0