Crankcase ventilation with blow through supercharger

I'm contemplating putting a blow through supercharger on my 360LA and in the process of thinking about the details of actually making it run a question came to mind (one of several, btw). What do you use as a crankcase evacuation system? Right now my normally aspirated engine is using a standard PCV valve plumbed to the base port of my carb. Doesn't a blow through supercharger negate any manifold vacuum?

Thanks in advance.