Give the Shelby Registrar a shot first as 12bolt suggested. When I bought my 69 GT 350 I ran the VIN by Vince Liska and he ran through the previous owners as well as what warranty work was done on my car. Ford has admirably kept all production data on these cars as well as many many others. The SAAC is full of knowledgable people that love the cars and are willing to help you out.
Good luck in your quest
