This probably won't help you, but... I have original paper, pop, dealer invoice, etc, for my 68 Chevelle So I just looked the original owners name up in a site for phone numbers and got lucky with the 1st call. I found his 80 year old father who signed for the car in 1968, and he hooked me up with his son. I've talked to him several times, and he even came up from Ala to CB06 in Nashville to see the car he bought in 1968. He sent me a pic of the car. This was taken shortly after he bought it from C.D. King Chevrolet in Russleville, Alabama in June of 68...
