The only A833 O/D that has an iron case from memory are the late '70's pickup trucks. I'm thinking it's going to be a lot easier to just swap the gear set into any A833 iron case that uses a rear 308 thrust bearing, given all of the gears and shafts, along with the short tailhousings match.
Ma Mopar made OD A-body 4-speed with an iron case and tail shaft.
I rebuilt one a couple of years ago from my parts stash from over 25 years ago.
I can post a crap load of pics if you need it with serial numbers on the case.
