All 'A' bodys are not equal
My sons 68 Dart 270 has its rear sub frame welded in unevenly. When it had the 155/78 13's you could not tell by looking. But once Tubbed and we put some 275 /45 18's on front and 325/45 20's in the rear the right side tire is too close to the fender.
The A body 1965 Barracuda has bigger rear fenderwells. I had 245/70 15's back there and could put my hand all around the wheelwell. When we put my LRT's slotted 15 rims on it with 275/60 15's they fit tight and did not rub unless in a corner or if I had two 200 pound guys in the rear seat. Running SS springs in stock location. Pictures are with the Cop Car Rally's and 275/60 15's