Idle Transfer Slot on secondaries?

Bewy said
PCV. Once you have the idle timing correct, adjust idle mixture as best you can.
With the engine idling, in gear, remove the PCV [ it will probably be in the valve cover ]. If it is rattling, it is not working; there is not enough vacuum to overcome the internal spring.
If the pintle is not moving, gently push on it with a small screwdriver. If the pintle moves, it is not fully seated, which is also bad, because the pintle has a tapered seat, so the air being drawn past it idle will vary & make it hard to get a consistent idle.

Bottom line: PCV pintle needs to be pulled in with no movement at idle.

Fix for low vac there is an expensive Wagner adj PCV....or what I have been doing for many years: get a 3/8" bolt, & cut off about 5/16-3/8" length; drill a 1/8" hole through it. Push this into the PCV hose. Job done.

I have made my own 4 cylinder/carburator manometer using welding tips I see what your trying to accomplish with making a restricter to smooth out a potential problem from the PVC.
Not sure I need to worry about the PCV as I am having more basic issues like the fuel mixture screw not being effective. That’s a carburetor issue from what has been explained here. The solution is tuning the carburetor. If the PCV however is causing bounce which I certainly am having can’t I simply disconnect temporarily from the carb and plug it and move on dealing with the tune? If the bounce stops that will also tell me that indeed the PCV is causing that.

Remember I do have a somewhat reasonable distributor curve one that I should be able to tune the idle circuit with. Its no 48° at idle but it is 28°.