noticed in Marty's book under "Acknowledgments" he thanked Joel and his wife for "endless hours digging through old files" .
There is a lot of info in Marty's Motion book that I had not seen before and I have been collecting Motion articles since the 1970's.
I was looking at other on-line articles but they don't always say exactly how the car was documented.
In some cases Joel has documented cars after he inspected them.
In the case of the 1972 Motion Moray GT Corvette it was built using two Motion kits and still had some of the paint on it Motion used. I don't know if paperwork was found on it but with a one off car like that I think an inspection by Joel with his letter is pretty iron clad documentation. In that case the "old files" may just be Joel's memory of building it.
http://www.corvetteonline.com/news/m...million-bucks/