Actually the question about a 6 cylinder car being built before these is a good one. Unless you actually worked at the plant and documented the order they ran down the line no one knows the true order. The 6 cylinder cars were built on the same line at the same time but use a different vin sequence for the last 6 digits, the last 6 digits start with 6 while V-8 cars start with 1. While those two cars 100001 and 100002 are without a doubt the first two V-8 firebirds built the first 6 cylinder car was 600001 and was built on the same line right along with the V-8 cars. The 5th V-8 car built 100005 surfaced several years ago. It was a loaded 400 convertible and was also a GM show car billed to zone 35 dealer 997. The firewall tag next to the body number was SHOW8. Notice that car 100002 is body SHOW4. Interestingly if the 2nd V-8 car was already body 4 and the 5th v-8 car built was already the 8th body what happened to the bodies in there already not accounted for. It would be likely to suspect those bodies were used for 6 cylinder cars. Car 100005 had a body date of 12C, those two V-8 cars 1 and 2 are 12B dated bodies. Both V-8 cars 1 and 2 were invoiced to zone 7 dealer 991 on 2/16/1967, apparently that was when they started tracking billing history as if memory serves me car 100005 was also 2/16/67. Another interesting bit of info is that the billing date on the billing history does not actually tell you the build order either. By that what I mean is a car with a higher sequential vin number may have an billing history date prior to one with a lower vin. According to Jim Mattison at PHS it was because a car was not invoiced until it was actually ready to go. If a car came off the line and had to have some fixes or imperfections redone it would not get billed until those were finished and the car was ready to go.