[Keith Seymore]

Sorry - half the time I can't get past the verification, making it difficult to reply.

I worked in about a dozen GM plants across 46 years in the industry, starting at Flint Assembly in 1979.

If you don't already have it "Echos of Norwood" by Phillip Borris would be a good reference.

https://www.norwoodassemblyplant.com...f-norwood.html

And, although this was written for 1st gen Camaro the Camaros.org overview written by John Z Hinkley is the best process review I have seen, and can relate to any GM product, include Firebird.

https://www.camaros.org/assemblyprocess.shtml

Understanding why and how the buildsheets were used will give you insights into where they can be found (or not found, usually).