The Ford "O" ring kit for the HPOP does not include the "O" ring for the non-servicable plug. That non serviceable plug may be what is leaking. International sells a rebuild kit for a 6 cyclinder HPOP that has (2) of the correct "O" rings for the 7.3 non serviceable plug.
If the oil has settled in the forward depression of the engine valley, directly under the HPOP, it's highly likely it's your HPOP lines or a blown "O" ring on the non-serviceable plug on the HPOP. The IPR can leak as well.
Usually if it's a turbo or pedestal "O" ring you'll get more oil in...
I just had a similar leak on the "non-serviceable plug" on the HPOP. Ford has a kit but it comes with only 3 of the large O rings. None of which are for the small plug.
Went to International and they had a repair kit for a HPOP for a 6 cylinder. But, it had the correct O ring in it. Otherwise...