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Hello. Welcome to Just Answer. Please allow me to assist you. It may be possible you have the wrong water pump. There are 2 pumps for this engine One has an R on it, because the serpentine belt runs the pump different than the conventional V-belt driven pump. Or, the wrong impeller was installed on the replacement pump. It takes quite a bit to cause the cylinder head gasket to fail on this engine. It is possible, depending on how long the engine was ran with an overheat condition. A good mechanic with a tool that screws into the spark plug hole (where shop compressed air is charged into the cylinder) would reveal a bad head gasket. I would recommend this be done before you start with parts replacements. If the cylinder head gasket si not blown, you need to verify you have the correct water pump.
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