68 may or may not have a VIN stamped on it , if it does it will be on the rear of the block , bellhousing flange on the drivers side , Auto trans should be stamped in the same spot. The CCCD is factory markings for which size piston got installed to get factory spec piston to wall clearance.

I don't know why you would be disappointed because it has had some work done unless you were lead to believe it was untouched .