In 1967 you could order the GT with the 289 2-V(C-code); but not in 1968! Kerry, I too would like to see a Marti report if you could post it. It would be real interesting to see the entire option list for that car. If it does in fact exist I think I would pay Kevin Marti to research how many 68 C-codes were built with GT option because it should not exist.
1968 is a very confusing year due to the mid-year engine additions and deletions. The quarter reflector changes, seatbelt changes, UAW strike, the change of the 289/302 engine blocks, etc., etc. In reality the more you look and research the more you find. All the early model Mustangs had minor mid-year changes that are often overlooked until you really examine and compare model years.
As stated earlier, some standard equipment of the California Special were in part also included in the GT option which makes it all the more confusing. I always wondered if a California Special was also a GT did it have the standard pop-open gas cap (included in CS option) or the GT pop-open cap (included in GT option package)? I've seen them both ways, but have never seen an "original" car to know 100%. Same goes for the center caps of the S/S wheels?! The CS sales brochure addresses some of these thing; but not all (ie. fog lamps).
Danny