Appropriate Wheel Offset for 18" Wheels?

I ordered 4 of the AMR charcoal wheels for my dart project. I haven't done a test mount yet but hopefully will this weekend. I don't ahve tires for them yet but hope to run the 275/35/18 like BBSwinger but i will have these on all 4 corners. I will be running (eventually) a 8.8 explorer rear with the drivers side cut down some. I will mini-tub the rear (for future tires fitment). The wheels don't have quite the offset I was hoping for but for the money you can't beat them.