Early A max tire size

My formal '64 Valiant, 2-door post, in front it was a 205.60.14" with a wolfrace slot wheels and a back it has a 275.50.15" in a compomotive 3-pieces custom made wheels, orginal rear 8.3/4 for the A-body, and the leaf springs was an orginally place, only problem was , if somebody went a backseat the tires hang up with a body...
and the Valiant's body was a orginal all the way...