Magnum in 70 Dart, can't keep it cool.

I also have a 3 row Champion radiator on my 408 stroker Dart. I'm running 2 12" pusher fans right now and have the same issue with the temp slowly climbing. I'm not sure how high it would go because I shut it down if it hits 210. I'm going to add a large fan in a puller config next to see if that helps. I'm wondering if these radiators are just junk.