69 Dart w/ 383- New Radiator Options

I was looking at one of these but I have no experience with using them.
http://www.ebay.com/itm/391402199585?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

This is the radiator I got for my Barracuda. It's a nice piece, well crafted, but my car still runs hot. My car runs a 440 fuel injection with mild cam, mechanical fan. Can't blame the heat on the radiator. There are just too many other variables at the moment. The only complaint is I had to have a fan shroud made for it. My car did not have any radiator in it when I bought it.