For some reason everyone thinks Corvettes are lightweight cars. Heck, a modern Firebird weighs more than a 57 Chevrolet 2door sedan. A 53 Olds may be a match for a Corvette. Check your title and see what the registration weight is, then check Corvette websites and see what they weigh. If the figures are within a couple hundred pounds either way and you like the idea..DO IT.
The suspension on the front of your car, rebuilt correctly would make a very nice driving and handling long distance cruiser. There should be some easy way to convert to modern disc brakes. Same in the rear though the springs (parallel leaves, yes?) may need replacing or at least rebuilding.
If that is not a go deal, a rear steer 68-74 Nova front clip may be the answer. Go for a 74 if possible, and don't just look under 2door cars either. We got a super nice disc brake, power steering clip from under a plain jane granny Deluxe 4door sedan.