How do you replace a water pump in a 1970 Buick Electra 455?

To replace the water pump in a 1970 Buick Electra 455, first, disconnect the negative battery cable and drain the coolant from the radiator. Remove the fan and the fan shroud for better access, then detach the belts and hoses connected to the water pump. Unbolt the old water pump from the engine block, clean the mounting surface, and install the new pump with a new gasket. Reassemble the components in reverse order, refill the cooling system with coolant, and check for leaks.