http://www.camaros.org/suspen.shtml#Wheels
So you'd probably want 15x7 Rally Rims.
15X7 Wheel Vintique's Rally 4.5 " backspacing
F 215/60/15 R 245/60/15
235/60/15 seem to be a popular choice as well
14" SS Wheels look better IMO. You can probably get larger diameter versions now. Tires are getting hard top get in 15s. This guy is running 245/60/14s all around.