From personal experience, the 3/4 inch tubes on the Champion radiator are too small and plug easily.
Once they're plugged, there's no way to unplug them so you end up buying another radiator.

Go with a radiator with a larger tube size from the start.

There are plenty of vendors on ebay that sell the larger tube size radiators for the $200 price range that are direct bolt in and resemble the factory radiator.
Factory shrouds bolt directly on them and they cool perfectly.