So guide me here. I get the plugging the PCV hole, I've found plug for that no issue.
On the fill neck side I assume I need an air tight cap with a venting line? Does it push in to the fill tube or do I have to replace the tube?
Or vent from the PCV hole and use a solid cap on the fill tube...
Whichever way works for you with the parts you find.
Basically the engine and computer don't care where the air is sucked out of the crankcase (PCV valve) with full vacuum, or where metered and filtered air is allowed back into the crankcase (vent) as long as the metered air return is between the mass air flow meter and the throttle body.
It just cares that you have a clean loop.
Since most of these Ford setups have that hose fitting right on the throttle body, and it's usually facing the passenger side, people usually figure out a way to run the vent line to the passenger valve cover.
You can run it to either one, but there would be less tubing running around if you keep it short and sweet.
If that's your oil fill, then yes the easiest is usually to have a tight cap and a fitting on the tube. And if your particular neck does not have a hose fitting like the factory one, you have to make your own. That can be in the tube, or even the cap itself. Whichever is easier in your particular application.
If for some reason it's not going to be easy to create a hose fitting on that tube, or on the valve cover itself, then maybe something over on the other side like was suggested with the gutted out PCV valve?
Not sure everyone can use that method though. Depends on how much clearance you have between the driver's valve cover and the upper intake plenum. Pretty tight fit usually.
But hey, all you need is a fit. Doesn't have to be pretty!
Good luck.
Paul