I installed a lot of PCV valves in the 60's when they became mandentory on Cali vehicles and we were required to "seal" the engine to the outside atmosphere. As I look at all my current vehicles it is still that way. I don't understand your idea to "flow" air thru the engine. Since the PCV valve sucks air into the intake below your carb this will cause a lean condition if I'm reading you right.
The PVC valve is manufactured to work in a negative atmophere. One of our old checks was to place a device on the oil filler and make sure there was a negative draft in the engine.
Negative is good. I run my racing engine at 9 on a 0-30 vacuum scale and use a pump to do it.....Good Luck
