The schedule of events for Friday, September 26, 1969 lists "Tamson's Chevrolet" in Danville, Virginia as the registration and inspection site for the racecars and drivers. This is probably also the dealer that supplied the 1969 Camaro RS/SS Z11 convertible to the track for use as a pace car.
Interestingly, the #18 1969 Camaro ZL1 was sold new by Tamson Chevrolet on July 15, 1969.
https://www.virhistory.com/vir/69-sept/scca.htm