Almost forgot to follow up here for anyone else with the same issue.
The master cylinder was a 67 mustang/cougar/fairlane, ect-essentially every car built in 1967.
Swapped it on, spent some time adjusting the push rod out a little at a time and we have brakes now. I did have to cut off the brake hose fitting and change to a new one (and reflare the tube) but all in all it went pretty smooth.
â€œPolitical Correctness is a doctrine fostered by a delusional, illogical
minority, and rabidly promoted by an unscrupulous mainstream media,
which holds forth the proposition that it is entirely possible to pick
up a turd by the clean end.â€
â€• Texas A&M Student