Why would you use the front faces and put them on the rear when the front faces give you the caliper clearance you need unless you have both front and rear in the same face.
If you're modding the barrells, why not go the widest you can and get a 11.5" rear wheel? To answer your offset question, I need to know if you have your rear fenders rolled or you can go to post #1269, 1272 and 1273 depending on your rear fenders and how aggressive you want to get.
I moved the rear barrels to the front faces so the front wheels will be 9.5 wide instead of 8.5. The front faces are staying on the front to clear brakes. I would be interested in an 11.5 wide wheel for the rear if possible. My rear quarters are shaved but not sure how much.
So rear options would be
Thanks!! Wasn't sure if the same size would apply to 19" wheels as 18" wheels.