Oil in the Floor?

[wfreschke]

Been having some issues with oil in strange places in my car lately....Just replaced the radiator because I had oil in the water, now the car is running funny (no power) and my entire passenger side floorboard is saturated with OIL. I have had wonders on maybe i may have head gasket problems. There is also a crack in the coolant elbow connected to the belt tensioner. Still have no idea where the oil might be coming from to get inside the car.

2001 Pontiac Grand Prix 3800 V6 130k miles

[3100]

maybe that is coolant from heater core

[wfreschke]

where should i check for the heater core? definately coolant pouring into the car