The Eagle Alloys 16x10 has less offset than the stock steel single rear wheels. I don't know if you saw this page but there are some pictures of the wheels mounted on my GTC and you can see the difference, especially where you can see how much of the drum is visible.
http://www.hallgtc.com/hall_001_wheels.htm I probably wouldn't go much less than the 4.5" back spacing on the rear. I haven't tried the front wheels as I don't have any other than the stock ones.