Upgrade for '70 Swinger 340 rear

do you happen to have a side shot of your car with them in?

If a been numerically 21 years, you can find some pictures below. The ride height is low in the front and not finalized. Once you raise the front up, the rear fender gets a little lower. The tires are 28” diameter.

rumblefish's Duster project

And a little bit in this short video below. The ride height is hard to see as the angle of the video is t focused on the tire height.
I hope this helps.