I don’t know why, but I enjoy titling posts like novels from 1900. It’s slippery because it involves oil, and there was also smoke visible in the car’s mirrors!
When I took the Chevelle into its short term storage (for garage renovations) it was the first long drive it went on, and I noticed that it smoked at hot idle. Before bringing it back, I checked my primary suspicion and did indeed find oil inside the vacuum line to the PCV.
As a refresher, the PCV is more or less a metered vacuum leak which pulls fumes out of the engine (there is a breather on the other side to let in fresh air) for an array of benefits, including making the oil last longer and decreasing crankcase condensation. I had installed mine on a neat adapter I found, which screws into the fill plug on the valve cover and thus serves double-duty.
Unfortunately, this placed it directly over a rocker arm, which means at high engine speeds there is literally a jet of oil onto the bottom of the adapter, which after a short while would fill with oil and lead to A Lot going through the PCV and into the intake.
The fill port has no provision to install a baffle (why would it) so this means I had to actually put it where you’re meant to, in the front of the valve cover (which I was able to install a baffle inside of to prevent oil from spraying into the PCV valve; sorry, no pictures).
A bit of rerouting lines later, I don’t think it turned out too bad. Not as pretty as before, but at least it shouldn’t be ingesting vast quantities of oil in high-vacuum (idle & decel) scenarios.
As a fun fact to close things out, when I took the PCV and its hose off, there was several mL of oil that came running out of the hose. It was sucking up a lot of oil.