The chance of the cranks being interchangeable is very good. I have swapped out cranks and it worked. I don't remember exactly switching out a Huffy with a Schwinn, but my money says it would work - worth a try anyway.

You know, the old Schwinn Continentals had BIG gears on the freewheel (I think 37 teeth on the biggest?). If you combined that with a triple in front, you could probably ride straight up the side of a building (at about 0.3 miles per hour).

It would be a nice combo for touring, hauling groceries, or for riding the hills.