heating issues when idling 340 73 duster

Syleng1 said
This makes no sense- the fan is pulling air thru the radiator. Unless the shroud is day 20” in diameter and the fan is a lot smaller like 16” in diameter. The shroud prevents the fan from sucking air off the tips of the blades - an easier path than thru the radiator. The shroud should be close to the fan but having it sticking out does nothing.
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the point of the recommendation is that it's a fact that if the fan is too far inside the shroud or too far outside the shroud, the efficiency plummets.
Most factory OEM fan/shroud combinations from the 60's are, give or take, are about even with the lip of the shroud opening.