It will all depend on what condition you need the car, a driver or something fully restored. Lots of nice cars out in the market place right now but have varying degrees of restoration. If you are looking for numbers matching, fully restored, nice color combination and with original documentation then I don't think $50K will do it. If you find a car somewhat restored and numbers matching with no documentation then yes lots of stuff out there. Have you looked on E-Bay, Cars on Line, Team Camaro, just to name a few.
Buy nothing until you have the car inspected by someone who knows these vehicles like Jerry MacNeish. You can also post pics of the car, trim tag and stampings on this site and others to soloist feedback and be careful lots of fake cars for sale with bogus trim tags etc.
Best of luck in your hunt.