You can't just bolt in 68 tail lights in a 67 body, I'll bet the quarters have been changed for the cheap repops. If there was a picture of the upper part of the firewall I could tell you if it is a 67 or 68 as they changed the drains in 68.
If there is no evidence of a door post VIN being removed, it likely IS a 68, as the VIN is on the dash. Looking up under the dash for matching OEM paint overspray might confirm that.
With the VIN, the body stampings the fender tag and a build sheet, one could run it down for sure. I would guess the rear quarters are reworked
I'm sure I've read that the headlight buckets are too "narrow" in 67 to fit a 68 grille