Help me confirm my measurements and back spacing thought

70Roadkill said

Thank a for all the feedback, this weekend there is a pretty good swap meet near by, probably not much mopar but a lot of ford stuff so same bolt pattern. Hopefully a set or 2 there with tires I can take a level across and measure to see the dimensions and maybe pick up a set.

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Best way is to beg, borrow, or steal a set of wheels/tires that are a little narrower than you want, with a similar wheel offset. Mount them on the car and measure/observe what you have for clearances. Measure the tire and the wheel too. Now you have known measurements. Which are a very good place to start calculating what you might need to do to make something bigger fit.