'73 up brake distribution block/proportioning valve question

I don't see any thign to argue about here.
It was all important info for MichicanPat since it turns out that the car is a '76 model, and '76 has a number of differences that is worth knowing about.
Furthermore, I think its good for @michiganpat to know that the replacement parts from the parts stores are not always correct. Not so much the stores fault as the rebuilders who lump things together that are 'close enough' and that unfortunately includes brakes parts.

@H22A4 Thanks for posting that. Bard's article doesn't fully coiver '75 and '76 A body M/C
I started a cheat sheet for A-body masters a few years ago.
Maybe we could start a new thread and update it with p/n and casting numbers for those years.
Also it looks like they went back to bail tags.