One of the ... no - the very finest Martin I ever owed was a 1973 Martin D35 ..and I'm fussy!
Guitars are individuals. Yes, the '70s wasn't the best era for Martin (and others) but it doesn't mean you should disregard every guitar they made.
Regarding action, old folks like me in the UK and Americans mostly measure in Imperial so I would say that the most common action at the 12th fret from the top of the fret to the bottom of the string should be about 3/32" on the bass and 2/32 (1/16") on the treble.
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Silly Moustache,
Just an old Limey acoustic guitarist, Dobrolist, mandolier and singer.
I'm here to try to help and advise and I offer one to one lessons/meetings/mentoring via Zoom!
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