Where is reverse?...

Welcome to the site! :cheers: All a-833 trans had reverse to the top/forward left. Was the trans from a E-body or B-body? Sounds like it was, you may need to get one from an A-body car, A,B,E cars all had different shifter locations, A-body cars also has a trans with a shorter tailshaft with the shifter mounting more toward the rear. Check out this link...

http://www.slantsix.org/articles/4-speeds/ODA833fourspeed1.htm