Time to get started.

You have a truck rear end based on the fact that the spring perches are on top of the housing. Shouldn't be too hard to have the housing cut down, the perches moved, and you can use stock A body axles since they were all the same width. There was a post here that had a good chart of axle widths by year and body type. Right now my rear end is 2 inches wider than stock due to adapters. With 205/75/14 tires my sidewalls are within 1/2" of the wheel well lip. Hester measures 59" from lip to lip, so I would say the max outside tire to outside tire width is around 58 inches. by the time you get brakes and tires on it the one you have is going to be too wide. Maybe someone will be nice and chime in with a stock A body 8 1/4" flange to flange width.