Camaro Performers (I think they do 9 issues right now on a yearly subscription) which is much cheaper than buying it at the news stand.
Camaro Now which I'm not sure if its an annual publication or not. I only found one issue but its dedicated to the current generation camaros and mods for them.
Super Chevy and Chevy High Performance are good and have the occasional camaro article or news...but you can read some of the articles on line so not necessary for camaro only stuff like the two above. Anyhow, I think a few others can throw out some suggestions...