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One of the favorite options in the past was the two speed fan and shroud from the Lincoln Mark 7 or the 90s Ford Taurus or Windstar. You can usually pull all the relays with the fan, and you will need them because these fans have a very high startup amperage. However, they are supposed to work very well to cool an SBC. The original design kicks them in at two temp settings, so you only go to dual fans running if you need it.
Bruce
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