trying to decode my 69 rs z28

[drdave69]

First thing to note is that you will most likely NOT find a build sheet in a Norwood built Camaro.
As for some of the decoding - According to the cowl tag info, your interior (TR 711) is black standard, the exterior paint color (57 57) is Fathom Green top and bottom. Your body date is the 2nd week of October 1968 (thus no X code on the tag).
The rear axle numbers are for a 3:73 (BU) posi assembled on October 8.

[Unreal]

Without paperwork, or original driveline, it's nearly impossible to prove it's a real Z/28. You will have to rely on detective work to "deduce" its origin. Do a search here, and Team Camaro (Camaros.net) to get a list of clues. BU rear is a start, as that was the standard rear on the Z. Of course, it was available on other models, too.