Old Champion radiator leaks, Brand new Champion radiator leaks !
Probably just going to return it to Jegs as defective.
Then I'm thinking, I have a factory copper/brass radiator out of a '71 V8 A-body, but its been sitting outside for years. I found a local radiator shop near me, I'm going to call them tomorrow to see what they'd charge to clean it up, rod it out, or re-core it, whatever it needs, and to heck with this aftermarket stuff.