Close off the vac connection on the manifold and leave the lower crankcase vent open, or put a hose venting down on it, open to atmosphere.
Chances are it's not the pcv that's giving you problems. I had a bit of a chunk of something in my repeatedly cleaned jets cloggin things up. New jets fixed the problem altogether.
These are not really sensitive engines, IMO. Actually sounds like a spark timing issue to me. I still run points with the original coil no problem. Timing 7BTDC at idle up to 28 BTDC at 3k, (I think). 22 mpg, not great but After resurrecting it from sludge I've giving it time to shake out.
Once I got it sorted, I put a standard PCV, (fat end down) between the crank vent and the manifold, and used a vented filler cap to route a vent line to the air cleaner cover. At idle, it was obvious there was crank vapor coming out of the vent cap.
A standard (bad, mistaken) tweak to old engines was to rich them up. It makes them easier to start, but that's about it. It cokes up the rings and sludges up everything else. I'm getting mine to the point where I can run it hard and hot to get things blown out without resorting to water spray or seafoam.
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MPergiel, Walker, MI
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