Well, I have to admit that I don't spend much time collecting info from Novas. It's very interesting that the 4 digit code is indeed common on them. The only such codes I've seen on full size cars were absolutely COPO or F&SO.
Thanks to Glenn for posting the Chevy documents. Those are the ones I was referring to that I have.
And no, they don't show any production totals by plant. Those were different forms and only showed monthly ending VINs, with no other information about the cars.
I also find it interesting that Oakland used both cryptic codes and RPO#s at the same time. No full size plant did that in the 58-64 time period.
Verne