Real simple --- AUTORAD radiator and core support..... big crossflow with dual fans.... and put on a SPAL PWM fan controller. Wired properly it will bang both fans at high speed when the A/C calls for it -- and runs them AFTER the A/C is off for a cool-down period. It also just runs fan #1 at half speed and then ramps it up until you need fan #2.
Now -- You said you have a SBC 400..... and they were notorious (wrongly so) for overheating. The reason that block had overheat issues was that people stuck SBC heads on 'em without drilling the steam hole in the head AND the gasket....
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