pcv valve and breather/oil filler tube

[dhamilton62]

I had a quick question. My old block 350 currently has the early style breather/oil filler tube in the front of the intake manifold. I was getting quite a bit of blow by and oil vapor seepage out of the breather cap so I swapped valve covers so I can run a breather and a pcv valve. After doing so, I didn't really notice much of a difference and can't feel any suction from the filler tube or breather hole on the opposite side valve cover. I was wondering if I needed to now plug up the old filler tube hole in the intake? Does that affect to suction and circulation that the pcv needs to work properly? I'm pretty sure my rings might be worn and that's the reason for the amount of blow by but just wondering if that would help. Thanks so much!