Barracuda tire Question

If they still rub the lower lip of the fender, assuming the car is stationary and you have the wheels pointed straight, that comes as a surprise. Yes, perhaps you need to look at your ride height. But even with torsion bars adjusted up I dare say you would still experience rubbing at speed over bumps.

Perhaps you have too little backspacing, or as you comment the new discs sit out more than stock drums, hence the tire sitting right under the fender lip, in which case it would seem that even smaller tires might still rub (and would not be feasible anyway if your rims are 7 inches).