So im thinking about getting these wheels in silver 18x9.5 all around
http://www.tsw.com/alloy_wheels_carthage.php
They come in the 5x120 bolt pattern with 20 or 45 offset. My question is will the 20 be ok? I would rather not use spacers so im pretty sure that rules out the 45, and do not want them to stick out of the wheel well, its ok if they are flush with the lip

 

TSW makes some gorgeous wheels.

Camaro bolt pattern is 5x120.65mm, with about a 0 offset, so 20mm is going to be about 0.8" too much BS to fit the front, rear should be ok. You also need to worry about the wheel hubs as old GM stuff is very large and protrudes into the wheel a lot more than saw BMW or new GM.