Talk to a guy here named "Mopowers". He's putting 15x10s on his 66' Dart. I think he said his diff was 46" flange to flange and minitubbed with drum brakes. I'm kinda following his lead on this myself with a 65' except I don't have a diff yet. I don't know how a later model A body would differ though
If you look in the tech section i do believe there is a entry with the same exact thing your doing except all that was done was wheel well widening rather than mini-tub.I do believe they fit a 15x10 with a 12.5 tire.Double check.But i'm pretty sure .