GM-GMC: 1995 Chevy Cheyenne, gasket leaks, coolant leak

Question
I have a coolant leak and I am trying to figure out where it is leaking.  It is dripping underneath the truck at the back of the motor. At first I though it was the coolant reservoir but I ruled that out. My second thought was the heater core but typically the floor is wet on the passenger side carpet. I am going through about a gallon of coolant every 800 miles.  Any thoughts? Thanks.

Answer
typically a  95 5.7 leaks antifreeze at all or any of the 4 corners of the intake. it may also leak at the fitting for the heater hose and the frt or rear of the intake.  i dont usually see any head gasket leaks externally i would best guess that the intake is leaking   buy a cheap presure tester and load it to 16 lbs and see where it leaks out from