Fix my orignal radiator or just replace??

Its a scary game. I took a rad from a 440 ci Dart that was overheating, something black inside there to a "reputable" rad shop and they quoted me $1050 cdn to rebuild. I knew that was bad kind of accepted that diagnoses. I took another from an Imperial and was told the same thing. However, this one was good, I just wanted a cleaning. I ended up buying a two core aluminum with electric fans for $550 US. Its hit and miss. If you need originality, need to find a trustworthy shop. It they start on it, it could be $65 - $90 to tell you its toast when you could have spent that on a replacement.