One thing to remember when purchasing an electric fan is static pressure drop once the fan is attached to the radiator.
Some fan manufacturers will state the drop in their ads. Spal has the lowest drop of most all fans on the market. Have seen tests of fans rated at 3500 CFM and once attached to radiator the CFM rating dropped to 900. That's a 2600 CFM loss.
Spal HP fans are rated in the area of 2750 and the drop is 400, so you have a legitimate 2350 CFM rating.
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chopt50wgn's post in Modernizing Your Fan. was marked as the answer