Throw this into the pot. My '90 245 OEM Blackstone radiator lasted 12 years and 348K miles. Like all the rest, the plastic neck broke and that was the end of that. Prior to the neck breaking, it had not been leaking in the least bit.

I also regularly flushed the system every 2-3 years.

My local pick n'pull charges $49 ($39/10 core) for a used radiator, which is really not worth it in my book. You can get a new Chinese made one for $80 these days, and supposedly they'll last 3-4, 5-6 years. Research on the web says they are halfway decent. Nissens they are not, but...