@FUTURE MUDDER both of those cone shaped filters are not original. The PO was using those to keep unwanted stuff out of the engine, a noble purpose. The plastic bits are disconcerting, and I have no clue as to what and from where.
So there’s a lot misinformation available wrt engine venting, and I’ve struggled with this on my build a great amount. One of the contributors is there were options available for this venting and the applicable years also comes into play. And the use of existing vehicles’ parts as an explanation is always subject to originality.
Here‘s some info/Picts from a ‘65 parts book, 04 Engine Group. First the valve cover (C) - there is only one pict shown and it is without a vent (tube). But the associated parts listing shows 7 different part numbers. My guess is that the OPT with English one is the optional vented cover for US market.
Looking at the air cleaner, there are two types, a dry paper filter and an oil bath filter. I only show the oil one because it’s the only one with the hose (D) that connects to the OPT vented valve cover. What‘s important is that the valve cover vent is connected to the air cleaner unit that pulls are in, so it’s not a fresh air vent but a forced air evacuation. Because it’s before the carb it’s not a vacuum leak source being unchecked by a valve. On another note, the valve covered volume and the crankcase are at the same atmospheric pressure (within small time increments) because they are connected via the lifters and valve rods passageways - necessary for valve rocker oil to return to the crankcase. So there is some crankcase pressure reduction due to the valve cover vent when properly connected to the air cleaner. But as far as anti-smog enthusiasts... (next up PCV)—>
Now to the PCV, or rather correctly, the optional anti-smog system. It’s possible that in ‘69 this was no longer an option but standard, I don’t know but someone with access to a ‘69 parts book would know. Of note here in any case is that the ventilation valve output is connected to the manifold after the carb, hence the need to have the check valve to prevent a vacuum leak source. So when the pressure on the valve side is greater than the pressure on the manifold side, air is pulled into the manifold. Nothing (should) happens if the opposite occurs.
So now the questions - what to do if you don’t have a PCV, don’t have a valve cover vent, or have one of either (my case, just the vent cover), or both (as in your case). And that we both have oil coming out of our dipstick tubes at the top. Someday someone will figure this out.
Over. Good luck.
