typically, you can use either, the more important consideration is if the pump snout is of the proper length so the pulleys line up. at least, that's the way it is with big block Buicks. i would double check everything else in the cooling system though. assuming the pump blades are still in good shape, it shouldn't have a problem keeping up with low power conditions. do you have a clutch fan? does the clutch lock up once the engine reaches operating temp? have you had the radiator flushed? what kind of shape is the radiator in? have you tried new hoses and thermostat? the vacuum hose from the radiator to the pump is prone to sucking shut if it doesn't have the proper reinforcement in it, which blocks water flow.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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