Two more pictures of the Falstaff beer Camaro during the pre-race activities. I found them at goldmine.uncc.edu
UPDATE: This appears to be a picture of the second NASCAR Grand National race held at North Carolina Motor Speedway on October 26, 1969. It was called the American 500. I have come to this conclusion because the Camaro does not appear to be wearing the same white line tires that it has in the color pictures above. Also, the girl on the hood is a blond not a brunette as seen in the above color pictures. In addition, the stickers on the windshield are in different places.