OK and since we don't have the splash pan on the underside of the intake I am going to test a theory (OH no).
I have the same intake (well almost P-2) w/out a splash pan and I don't have any oil problems through the PCV system as far as I know.
So, what O'm going to do (if you all agree or think the filter won't collapse) is put a fram 3/8 barbed clear filter on it to see if oil is being sucked through there. From what i was told you all said it might unless I'm missing something.
The brake booster can run off of the other nipple on that same vacuum port.
The canister purge can be connected to the manifold port below the idle mixture screw (see the Holley picture I posted above). If you don't have that port on your carb, then T the canister into the PCV vacuum line.
The reason the canister signal should come from a CTO hooked to ported vacuum is, when the canister receives vacuum and the canister valve opens, thereby purging the canister of vapors back to the intake, you are basically introducing a controlled vacuum leak. This makes the air/fuel mixture leaner.
Gasoline doesn't atomize as well in the cold, so you need a richer mixture to create combustion when the engine is cold. That's why our engines have chokes.
With the canister purge signal hooked to full manifold, you are creating a lean mixture when the cold engine needs the opposite. You are also leaning the mixture at idle, which will increase combustion temps, make for a poor idle quality, and increase wear and tear. Not to mention making the carb very difficult to tune properly.