Originally Posted by FBinNY
First, put your place or residence into your profile, so someone here might steer you to a resource.
Without knowing where you live or any specifics about the crank I can't give you definitive odds, but it's very likely that you can find a comparable (same length, fits spindle) crank at a bike co-op. Many co-ops get large numbers of donated bikes of the same era as yours and strip them for parts, or cannibalize them so they can make one usable bike out of two or three relics.
So a co-op is the place to start, and if I knew where you lived I might be able to steer you to one.
It is a cottered crank, unfortunately. Removing the original cranks from a bike made in the 70's was not easy!
I'll update my profile ASAP. I live in Champaign, IL and I've actually got a bike co-op that functions as part of my University, so I'll give them a shot. First I'll try to bend it back, the other replies in this thread seem to think it's possible even though it seems like quite the hefty piece of steel.
Thanks guys.