71 Dart Swinger rear tire fitment

I have 18x8 zero offset 4.5 BackSpacing on my 71 dart swinger. My car originally had 4" bolt pattern but I switched it to 4.5" by just buying moser axles. This is all I could fit under the fenders. I can only get my fingers between the tires and skirts and have maybe a 1/2" between the leaf springs.

I run a 245/45/18 tire which a 26.5" tire and there is still room for another inch. Could easiler go 27.5" tire before running into the front edge of the wheel well.

hope that helps