1999 Chevrolet Malibu Replaced Intake Manifold Gaskets Water Pump Thermostat

I replaced the intake manifold gaskets, water pump, thermostat etc.. i still have coolant leaking very badly. It looks like it is below the head gasket, kind of where the water pump housing attaches to the block. Is there a freeze out plu located here? Is there possibly a gasket behind housing? I appreciate your help. i am donatimng $2 but willing to upgrade if information cures this dang problem.

thanks
John Huff