Quote:

its entirely possible for a '67 to be built in the later half of '66.




"Possible".... to say the least since 67 production started in August of 1966.

As mentioned, the 1967 Model year was the first for the GTX, the simple answer to what he has is the VIN# which would have to start with either RS23J7 (Hemi) or RS23L7 (440).