Dash tag and Firewall tag different?

[SS69chevelle]

Nick, I don't know about Novas but for 1969 chevelles it is the same way for some of the assembly plants. It is always good to check the VIN when considering a car not just the body tag due to this example. The reason may have been due to a body being built and placed in the body bank awaiting an order or assembly, then when the order came in the engine requested was the 6 cylinder vs the V8, the Fisher guys wouldn't know and likely wouldn't care what engine was going into it they were just making the body and sending them to the final line. hope this helps, there may be a much better explanation but that's what I know from my research on chevelles. take care, Andy