Oh, yeah it will. That was *the* best steel MTB frame Schwinn could make. DB Cro-mo, tigged and fillet-filled head joints and lugs everywhere else, all the braze-ons a man could want, good geometry.... they're quite desireable.
Can you give me a tooth count on the freewheel? I ran the chainrings through the gearcalc, I think I see what the builder was driving toward but it's just conjecture at this point. Looks like the inner two are step-and-a-half, while the outer two are half-step. It actually makes a good bit of sense.