To the OP:
If you are in dire need of a 283 crank and its free; or you're building a numbers matching 283 from 1964, use it. If you just need a crank for a 283, find an earlier one that is confirmed as steel. I've been given 283 parts and if its a GOOD crank I could see paying $50-75 for a non-corvette piece.
Nothing wrong with a 283; get a rebuild kit from Northern, some moly rings, a 260H cam, a small aluminum intake manifold with a 600cfm carb and you've got a nice piece