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Steve I would suggest a JY solid steel OE fan with as many blades as you can find & space it ~2/3 into the shroud. You might wanna go to a smaller dia pump pulley to speed up the fan (air) flow and the water flow



Late 70's (eg Cordoba) had a 7 blade fan. A big one. It would need matched with a "heavy duty" fan clutch and would really move the air.