[juliosz]

I looked at some other stuff on the Heritage Center web site and found an interesting statement under the FAQ:

"Question: Where can I find the records that you do not have?
Answer: For Buick records prior to 1982, contact the Alfred P. Sloan Museum. For Pontiac records prior to 1987, contact PHS. While we continue to search for original build records and dealer invoices for Chevrolet, GMC, and Oldsmobile vehicles built prior to the 1977 model year, there is currently no resource available from which to obtain this information."

Long shot but at least it sounds like they're interested in finding the pre 77 Chevrolet stuff.