55 chevy rear tires

Put some 265 60 15 tires on the rear. had to put a shackle kit before I could get them on but they are rubbing on the wheelwell lip. I really don't want to radius the wheels or ruin the lip. I guess I will have to buy a couple of new tires but I am not quite sure as what to buy.

 

sounds like a backspace issue to me hows about a pic ?

 

Probably 235R75-15.

 

I have 15 x 8 with 4 1/2 back space with 255-60-15 on my 55 and they clear perfectly