There is nothing that runs under the intake in the valley except the 3 inches of hose going backward from the water pump then into the hardline which twists around behind the passenger side head. When I said I doubted the hose was leaking - I meant this hard line which is metal. The 3 inches of heater hose from the back of the water pump to the hardline may well be leaking. For your sake I hope that's all it is.
My guess is the manifold is leaking from the crossover right behind the alternator, then dripping down into the "V" which is why it looks wet down there. Even if you end up replacing the intake, you won't need a throttle body gasket because you just remove the upper intake "4.6L OHC" and the TB as a unit. No need to seperate them. You don't need tape for the injectors. Those have O-rings to seal them - you could get new ones for cheap and I would recommend it. Those need to be lubricated before going into the new manifold.
The fuel line tool slips into the circular fitting where the lines meet the manifold at the rear of the pass. head. They slip over the line, and you push them into the fitting while pulling it apart. Be prepared with a rag for the gas leaking out.
There's a few more tips I can give:
Don't remove everything from the intake while it's in the car. Disconnect the fuel lines, wiring to the injectors, the air intake tube, EGR tube and what ever else is holding it to the engine (plus the 10 or so bolts). Then, swap the old parts (fuel rails, injectors, upper intake, etc.) to the new intake on a workbench. Much easier that way.
I would spray the EGR tube nut with penetrant now and let it soak. Sometimes that can be a pain.
Also - you will need to drain the cooling system. Be sure to get more a/f for that.
Reason I asked about the Navy - my brother-in-law is sometimes stationed in Norfolk on the USS Montpelier submarine.
Any more ?'s are welcome.