Yes and no. As far as I know no however, in addition to the “special editions” made for the press and the like noted elsewhere in this topic, there was also on occasion certain “employee” cars that were built at GM Baltimore that said one thing on paper and had something quite different in it’s physical form. I personally knew of at least 2 of these in existence in Maryland over the years. 1 was a 1969 Impala the other was a Chevelle though I do not remember the year. I do not know what has become of them. Both were stripped to the bones on paper though were heavily optioned with all of the goodies tucked away behind plain Jane door pads or made incognito as they were being built. Though the order had to be placed at the dealership, the order number and vin of the vehicle was made available as the vehicle went into production with some creative replacement of build sheets from formerly manufactured vehicles inserted at different areas of assembly. Anything questioned was “fixed” ( hot-punched/ignored) elsewhere in process. As a Baltimore native and a 3rd generation employee in that same building, I got to drink a lot of beer and hear a lot of talk from the people who built those cars, too many eyewitnesses and participants to be a rumor. That being said, this not only potentially applies to the GTO, but to ANY vehicle that was manufactured at that assembly plant. Baltimore built Olds, Chevrolet, Buick, and Pontiac all on the same assembly line and had a truck line in operation in the same building to boot. I’ll let your imaginations run from here.