Scargo I can't see how oil could be forced out of either of the crankcase vents. At least not anything larger than oil droplets in the air as it's all churning around.
Mick is using a Peterson Pump. Element is the smallest, the Aviaid version I'm using is the smallest of them all. Maybe neither is strong enough to create enough vacuum to prevent this. Maybe the Dailey and Cosworth are strong enough.

I went ahead and setup the initial plumbing to Phil's reccomendation, that is the PCV port teed to the front head vents and then to the tank. I can easily just plug the Tee and the line down to the PCV port if I want to try it the other way.

I've thought about adding a simple in-out catch can to that line near the tank just to trap up to a liter of oil on the way to the tank and try to get an idea of just how much oil is being pushed from the heads and pcv vent.
Almost done with my install. I discovered last night I need a couple of different -12AN fittings than I had planned on.