Plymouth duster rear suspension questions

Although the car is not in minitubbed. I would like to fit the widest tire possible that I can in the rear
Inner wheel wheel is the limiting factor.

Also if your planning on hard cornering you either need to keep the rear from moving left to right or allow enough enough room.

I have skid marks on the inside of the wheel well from a hit the left rear took in the 80s. That's with stock 175 to 215 wide tires at the time. That's how much flexibility a leaf spring rear can have.