Here is an interesting ad that I picked up from a vendor at the Muscle Car & Corvette Nationals (MCACAN) several years ago. In it you can see one of the 1968 Camaro RS/SS 396 convertible pace cars used at Daytona International Speedway during Speedweeks in 1968.
This was a two page ad for the Permatex Company, Inc. that appeared on the 2nd and 3rd pages of the April 1969 edition of Super Service Station, which was a trade publication for gas and service stations.
It is interesting to note that they used a picture of the pace car for the 1968 event in an ad that appeared in a magazine that was published several months after the 1969 event was run. Furthermore, the ad was promoting a chance to win a trip to the 1970 event. (see the body of the 2nd page of the ad in the next post) They probably ran the same contest the year before and just continued using the same ad layout only with updated text.
Also note that the car in the ad looks to be a different one from the car in the first picture above. The Camaro in the first picture above is missing the first quotation marks in front of the word PERMATEX. The Camaro in the ad has them. Also the number 300 looks to be lower on the fender in the ad than it is in the first picture. This seems to indicate that at least two Camaro pace cars were used during the Permatex 300.