Ok. If you don't have a good shroud it'll never cool good no matter what radiator you have. And a pusher fan is something you should only ever use as a last resort. They actually block some air flow. What you need is a good shroud. You can have one custom made probably less than a new radiator (that won't fix the issue) would cost, or just put the Northern radiator back in it that worked right. Seems I remember a couple months back you swapping out a good running carb for 2 or 3 that didn't run worth a crap. I don't mean to be a jerk but can't help but wondering why you keep changing things out that work right ending up with things that don't work right??? Have you ever heard the old saying "if it ain't broke don't fix it"?