Steve Shauger is the best contact for that. He had seen photos and heard a little about my 69 RS/Z and invited us to the Camaro Nationals in Pittsburg a couple of years ago. Needless to say, we had a great time and road trip. He and many others judged my car for hours and hours and gave me several pages of what they observed. It was great fun and I came away with what I feel is excellent documentation on my car. I really appreciated the opportunity to show my car and hopefully will be able to attend again one day. Thanks Steve and others!
I believe they have several different classes depending on the condition and/or restoration of the particular car. I saw cars that were all original to fully restored being judged. It was a great experience, and if you buy any car that has been judged by these guys, you cant go wrong IMHO. My car is for sale currently if anyone would like info
.