63 Dart rear axle relocation.

I did a similar thing on my 65 Cuda, 8 3/4 with 4.5 Yukon axles. I used 275 40 17's in the stock wheel wells. I had to move the rear back 5/8's of an inch and this put the tires in the center of the wheel well. To put this rubber on the car I moved the springs in, but wheel wells are stock.
Pettyblu's Dart looks nicely centerd.

I think 2.5 inches would push the rear to far back.