Hmmm...don't know about that. NC8 first appears as an option in the January 2, 1969 Price Schedule:
"Available only when Camaro SS or Special Performance Package is ordered."
The April 1, 1969 Price Schedule is different:
"Available only when Camaro SS with 325-hp, 350-hp or 375-hp engine or Special Performance Package is ordered."
So looks to be a small window of potential availability for NC8 on an SS 350. Or, Chevrolet may have declined to build the car and later changed ordering info.