Hershel McGriff racing a Ford at Daytona !?!

This is really one for the experts! Now, y'all know that Hershel drove mostly Mopars, like the West Virginia Almost Heaven Charger when he teamed up with Richard Petty. Judging from the picture that François Breton, an Oly fan from France, dugg out on the web, Hershel also raced a Ford at the famous Florida track. Which race was it and what year? Whoever gets it right first, wins a 2008 Oly Express team shirt!