Need some help controlling body roll

My 70 Duster has a lot of body roll. The tires rub the fender on turns. The tires are 255/60/15. The fronts are fine. It is just the rear tires. I know the shocks are worn and they will be replaced. The leaf springs look good, but who knows. I have never dealt with them before and I really am not sure if they are tired or were they selected by the previous owner for ride height. I thought about rolling the fenders, but the metal is too thick. I dont want to cut the fenders either. I just want to eliminate a lot of the body roll out the car. What would you suggest?