Is there any way to tell if a 68Z/28 is real or cloned ? Is there a code like the 69's (X-33 or X-77)? Any help wouild be great, Thanks

No cowl tag codes on a 68. About the only way to tell is to match the VIN on an original MO block to the VIN on the dash, and also the "hidden" VIN's.

One thing you could easly check. If it is a Z/28 it should have a round white sticker inside the glove box door. This sticker should have the tire size E 70 X 15 4 ply rating. The tire pressure for the tires will be on the lable. One problem,one could have put a Z/28 glove box door on the car.