If you're talking about the 60's machine, buy the stock camaro in the Chevrolet new car dealership, then go into GT Auto and choose race modify (it's the one on the far right). You can then go and add tuning parts as required and even paint it (the RM cars start as stock white). Worth the effort, it looks awesome. I have yet to drive it, so I'd be interested in your experiences.
Have fun.