i use 2 electric fans on mine. with the engine so close to the radiator, i had no room for a mech fan. there is one snuggled on left and right near the water pump pulley. i have no cooling problems. i do have a alum rad.
have you or can you run a 7 blade clutch fan. they are cheap to pick up and move tons of air. and cut loose when not needed.
also get the shroud done. it will definately help. tom

Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
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