Rear width/mini tub?

I was told to use a 15x10 w/a 7.5 rear back space rim if I chose to do what your wanting as well.
Mini tub for sure and roll/trim the right rear wheel well lip in 1/2 inch along the top side inner for tire clearence.
You can make your own mini tub also by moving inner wheel well into frame and weld a strip where you made your cut for width. Do a search and you should find more info. also.

I have the Mopar Perf. 3'' off set kit as well.
I'll run a 275/60/15 BFG tire also when done.

Good luck w/your project.

Mark