Here's a little tidbit following a conversation with our friend Tim Talbot from Redding CA.
On the 4.6-5.4L Ford engines, the PCV is difficult to spot as well as difficult to reach. After a conversation, he sent me to a video on YouTube from someone else on replacing their PCV hose. I extracted this picture of the PCV system (with upper intake removed) from that video on a 98 5.4:
If you look at this, you can see where the PCV hose comes off the intake to the rear of the opening. It then cuts left and then forward to connect to the PCV valve itself. The PCV port is always in this location OR higher up on the upper intake.
You will find these fittings in most cases to be oil-soaked (and leaky!). They are also quite large, requiring (I believe) a 5/8" cap ("Heater By-Pass Caps in the stores) to seal off.
Thanks, Tim!