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There is about 1/4 - 1/2 inch of head gasket that sticks out at the back of the head when it is installed correctly. AFAIK, all aftermarket head gaskets are this way to, but maybe not (this would help explain how people manage to put them on backward in the forst place).
The oil pump is... in the pan. If you are asking because of the comments about spinning it with a drill... You pull the distributor anddrive it through there. The bottom of the distributor shaft fits into the oil pump and that is what spins the pump. If the distributor is not completely seated on the bolck it will not ingage the pump and the pump will not turn, resulting in no oil to the engine.
For oil pressure... check the gauge.
While it doesn't tell you anything about the pressure, you can easily check for oil flow itself byloosening the oil flter. If it's ful of oil and starts leaking a mess all over the side of the engine... You're getting oil from the pump.
Mark...
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