70 duster street strip build

I dont have tires yet not even sure what size to get . as you can see i could probly put some tall tires with no probems and maybe lower the rear of the car some The front measurement is from inner lip of the wheel well
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What is the length of your rear end? I noticed you just got 315s on. I was thinking of putting 18x12s on with 13.20 inch wide tire. But wanted to see if they would work without changing the backspace of the wheel but if I had to I would cut the rear to make up for the need of more backspace. The issue is I don't know at what point I would hit the frame with 13.20 wide tires.