Kobbymike,
I would go for a bigger fan. At best the old 4 blade fans were adequate and 37 years of corrosion have not made the cooling system more efficient. The clutch fans are more efficient and should fit your shroud with no problems. If you do not take engineer up on his offer and go junk yard shopping, be sure to mount the shroud first and measure the closest point from the shroud to the center of the water pump. This will let you know the size fan that will fit because the shrouds seldom line up on center.
P.S. engineer, what do you want for a clutch fan? I'm installing a tripower and 068 cam in the spring so more cooling will be mandatory for me too!
BAH
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