I have the transmission tag from a 67 coupe we're just starting to restore. The tag reads: PEE C X. 7E1. B3. I know it's a C4, but what's the rest of the tag mean? The car has the original engine, tranny and rear end. The car was my wife's grandfather's. The rear end tag should be on the car too, just haven't looked. No work was ever done to the rear end. The engine has been rebuilt several years ago and unfortunately, the engine tag must have been pitched. Isn't the engine tag usually on the front of the block on the driver's side? Thanks for the assistance!!