PCV System Questions

[raoul.duke]

I've been reading various threads on this site regarding PCV systems and I'm curious about mine- I have been having problems with oil blowing by the passenger side intake manifold bolts and have retorqued/ resiliconed/ replaced gaskets/ etc. with no luck. Truck is a '72 with a 350.

Everything that I have seen on this site shows the PCV to be on the driver's valve cover into a vacuum port on the carb and a breather on the passenger valve cover.

The way my truck is set up by the PO there is a vacuum hose from a vacuum port on the carb to a fitting (open elbow, not PCV valve) on the top of the intake manifold right behind the carb, breather on the passenger side vc, nothing but an oil fill cap on the driver vc.

Could this be my blowby problem? Should I cut in a PCV valve in the driver's vc? If so, what is the top port in the intake manifold behind the carb for/ should it just be capped off?

Gracias.