I have a 1970 1/2 SS396, with RS body option, all stock and have owned it since 1980 (second owner). I have the 3 piece COPO rear spoiler and am sure it is factory equipment but can't seem to find out how to verify this, Can anyone help?
I to have a 1970, it is by far one of the most difficult cars to verify what's real and what's clone. If you haven't been to the NastyZ28 web site, I totally recommend checking out that site. They have the most complete set of documentation and information on identifying Gen 2 Camaros that I've ever seen the URL http://www.nastyz28.com/faq/2gcdiff.html
The VIN doesn't provide much information, they have an page dedicated to decoding the Trim tag.