This color image shows that a 1969 Camaro RS/SS Z11 convertible was used as the pace car for the Thirteenth Annual National Modified Championship Races held on the half-mile dirt racetrack at the Kansas State Fairgrounds in Hutchinson, Kansas on Sunday, July 27, 1969. Notice that there is writing in a matching orange color on the passenger side door but unfortunately it is illegible. The picture was taken after the final 50 lap race had been run. Notice how dirty the car is from doing several laps around the dirt track pacing the seven events held at the track that day.
Description and pictures of the event can be seen here:
https://kansasracinghistory.com/Hutch_Nationals/Fair/27Jul1969.htmCaption for this photo states: "Trophy Queen Janet Reimer and her attendants being escorted to the front straightaway on this afternoon for the trophy presentation. Riding on the deck lid of the car was “Peanuts the Clown” portrayed this day by Tommy Madison... Schrater family collection."