1973 Duster with make over

I received my tires from summit today. I ordered them at 2:45pm monday and they showed up on my doorstep at 11:45 am tuesday. Its crazy how fast I get stuff from them. I set the tires in place and they look good. I am making a wheel fitment tool to set the tire in place with different offsets. I am thinking about going with a 15x10 rims with a 5.5 backspace. I sat the new tires next to my old 205/75r15's, what a joke.