With a set of Dr. Diff's offset spring hanger kits you can bolt a B body width rear end,
(2" narrower than a stock E body rear)under an E-body.
Complete bolt in deal, no cutting or welding.
With the correct backspacing this will get you a 15"x10" wheel under the car and a good size tire.
I'm shooting for a 325/50-15 drag radial.