Trivia 'What was the First A-Body Super Stocker from the Factory'

I heard somewhere ...but not sure....

did Mr. Norm build any GSS darts in 67?

I thought I read somewhere that he started in 67 but I was not sure if that means that he built some in the year 67 out of the 68 model year cars OR if that meant that there are some 67 model year GSS in existence?