In the 69 CUDA M code registry there is build sheets with Transmissions 091 on build sheets but car came with 093 or they did have original trans in them. Also seen different carb numbers. Only number is confirmed as originals are the 4618. All these mistakes are on all early production cars.
It makes sense that the M-codes would have the most HD automatic available installed, I’m wondering where the upgrade was recognized by the assembly line workers. I always thought that the build sheet was the end all/be all but apparently not.