1 is the first of the last six digits on ALL V-8 Firebirds. 6 is the first of the last six digits on ALL L-6 Firebirds.
There are no exceptions to this in first gen Firebirds. There are in other makes/models, where production numbers went up over 100,000 and necessarily rolled the first digit.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
