['ol Pinion head]

Doubt the EXACT number of '73 T/A's in each of the 3 colors will ever be known.
With the advent of AI, it's possible that at some time in the future every copy of microfilm @ PHS could be scanned & interpreted with less human input than now. Whether the microfilm has degraded to such a degree that the M M in the color box can be read, that would be the problem. With '73 models being a strong year of sales for Pontiac, I doubt a full accounting ever happening. I've put off ordering the PHS on a few cars, as I have buildsheets out of those cars or know how they were exactly built. Time to spend some more w PHS & at least get the dealer numbers & names