[mr0077]

Well, good question...I assumed you didn't have an existing port on your manifold, but on my (original Ford) 2x4 intake there was a 3/8" port on the back of the rear carb pad just below the rear carb. I used that for the PCV hose. If your manifold has one of these, use it (the front and rear chambers are interconnected inside the manifold, so it shouldn't cause any imbalanced fuel/air conditions). If yours doesn't have one of these, don't use a port on an intake runner; I think you'd be better off to hook it to the PVC port on the "rear" of the front carb, which would be at the front of the motor since they're mounted backwards. Reason I say use the front carb is, although the motor should idle on both carbs, at idle very little flow is pulled out of the crankcase through the PCV valve...since you cruise on the front carb (with factory setup, anyway), most PCV function would be through the front carb...when you're at wide open throttle, very little vacuum is working on the PCV valve, so once again it won't flow much, and the relative volume of the PCV flow compared to the total flow through the carb or carbs is small and would have a pretty much insignificant effect on the F/A ratios.
Does any of that make a darned bit of sense? Hope it helps some...