Okay, after learning some new stuff...
Just ordered a Fram FV410 PCV valve, which could/should be in the ballpark for my 261.
Also got me a valve cover breather and a catch can.
This is the setup I got in mind:
I put a filtered breather on the Draft tube snorkel (and remove the actual draft tube of course).
The other breather goes on the valve cover and a hose from there to the catch can - than to the PCV valve and manifold vacuum.
Still not super convinced, but I give it a try.
