I have a Schwinn "Superior" frame I bought new in 1977, for a European tour.
I mounted a TA "Cyclotourist" crank and SunTour VGT running gear on it, and
it still runs great. Had to bend every other TA crank tooth
right-then-the-next-one-left to get it all to shift properly, but it did.
(Does that make you Campy ramped-and-beveled crank fans shudder?) However
it's fillet brazed Cr-Mo tubing, not Paramount lugged tubing, and it's
pretty heavy.
George Rausch