2000 Pontiac Grand Am possible blown head gasket

Engine Mechanical problem
2000 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic

I have had overheating problems after changing waterpump and thermostat still had a little problem but seemed to be ok. two weeks later while driving heard a strange noise and it started to get hot. when i pulled over the engine died and the coolant tank was empty the engine will not start. i pulled the intakes the top intake had water. drained the oil it is dark brown with a few bubbles. could the head gaskets need changed also. how do i tell if head is warped.