8 3/4 help!!!

What you got there Ken is the precursor to the 741 which was the 657 which had the ends of the axles tapered, keyed and the brake drum was held on by a nut with cotter pin. It was used from 1957-64 when the 741 arrived with it's flanged end axle shafts. In short you do not want to use these axles and you'll need new drums and backing plates (not sure about shoes and hardware) when you switch to flanged axles. I guess what I'm getting at is you may want to shop around for the proper A body length 742 rear end housing complete with brakes and components then use your pumpkin.

http://www.autohobbydigest.com/axlepul.html

Terry