Radiator Recommendations? 66 Dart, 360 LA

Is it leaking at a weld or from obvious corrosion? One thing about aluminum is that it work hardens and is suspect to cracking, heating and cooling does it just as much as twisting, flexing, and vibration. What brand and how old is it?

I have had the car 3 years, I am guessing it is at least 6 years old. It is a 3 row Champion. Thanks for reply.