Aluminum with copper and electrical charge sets up galvanic corrosion. The '77 Bonneyville for instance is recommended due to its size, but also it is made out of copper/brass. Almost all waterblocks are made out of copper because of its thermal properties, so you especially don't want to use an aluminum radiator. Copper core radiators do not rust or oxidize the water, and you will find that all PC radiators are copper core. Cars use aluminum radiators mainly because it is lighter and cheaper than copper, and in cars you need a high mix of antifreeze due to the need to prevent boiling and freezing which also provides a high level of anticorrosives, all of which are not a concern in PC watercooling. Antifreeze inhibits the thermal transfer properties of water, and hence we normally only use no more than 5-10% antifreeze if at all, which does little to prevent corrosion. So you want to stick with an all copper/brass core.
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