I have several 833OD trannys. Theres 2 that I know of. The short shaft A-body and the long shaft that was in trucks which has the later B/E tail housing w/ dual shifter mounts.
If your thinking of put the OD behind your 383 take note that the OD's have the large 5-1/8" front hub. They did make a BB bell that fits both 833OD and 435/445 trannys but is very hard to find.