widest wheel for 67 Camaro

[67rstbkt]

Originally Posted by EVS Motors Inc.

From my experience you can fit a 10" wide wheel in the back. A 275mm tire is the safest wide tire to run, but you can also fit a 285 with some fender rolling and trimming.

Probably a dumb question, but this would also be the widest for a 67 firebird? Also, I've been looking at some pics with the 275 rears, and they almost look like they stick out a little, is this how it is with this size? Or was the wrong backspacing used?
Thanks