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I have a 428 CJ too and my heating problems were precicely as you describe. I finally installed an aluminum radiator and now it cools within acceptable limits in Houston heat (200-210).
Conventional wisdom about better heat transfer properties of copper/brass aside, the alum units cool way better because the tubes have huge surface area where fins are connected. They use just two inch-wide tubes to maximize that. This design can not be built out of brass because it is too soft and the tubes will deform.
Two good brands are BeCool and Griffin. Griffin uses epoxy to attach the header tanks which has poorer heat transfer, while BeCool welds everything. I don't think this is a very significant difference. My Griffin is very satisfactory and it was custom made for Everett Morrison and about half the price of BeCool.
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