I am restoring a 1968 High Country Special. When we were doing the media blasting we discovered these factory markings on the core support under many coats of black paint. These marks were made with a wax pen so when the media hit it smeared a bit. I think it was a # 9 and a 51 in a circle. 51 was the Devver DSO number and where the HCS cars were sold. As you may know Ford build the GT-CS and HCS in batches and I belive that the #9 ment that our car was the ninth car in that batch. I was wondering if anyone on this site has any marks like this on their core support? Marty