How many years ago was the rebuild and who supplied the cam? New factory Pontiac cams haven’t been available for quite some time. The full part number for the “068” is 9779068. The factory used various stamped ID markings on the back of the rear cam journal depending on the cam-could be a single letter, a square, a letter in a circle, of a very limited number/letter combo. The number you referenced looks like IDs that I have seen on aftermarket cams. You could have an aftermarket “blueprinted” 068 cam or just an aftermarket cam with specs close to the 068.