Will They Rub? - 65 Dart Tire Wheel Combo

According to this post by 65Vart 8 3/4 rear axles are slightly narrower.
http://www.forabodiesonly.com/mopar/showpost.php?p=1646456&postcount=2

This would have the same effect as more backspacing on the rim. I'm still not feeling confident that my rear wheel/tire choice won't rub on my 7 1/4 axle.