Four blade, versus seven blade fan in my 225 Duster? Final report now in.

Hi All: I have a seven blade fan that came from a 1974 225 engine with a/c. It looks like it would fit my 1974 Duster non - a/c 225 engine. Would there be any benefit to changing to a seven blade fan? Looks like it would bolt right up with the existing spacer and would have no interference problems. Thanks - cruiser