Educate me on why 340 fan is not symmetrical

inertia said

Timing marks, timing cover, pulley depths, lower rad hose, power steering pump brackets, location are all diff between cast iron/alum water pump.
Just so you know.

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Thanks. Was aware of timing marks and timing cover. That is why I initially stayed with 70's hardware. I do not have power steering. The timing was told is not a deal breaker. Can have the radiator modified but can't do that to a year only radiator. Boils down to pulleys.