Just to make sure I installed my PCV valve correctly.  Using the valley cover with the road draft tube in back.  I remove the tube installed the PVC valve then rubber hose to the back the large vacuum port of the Holly 600 double pumper
Blocked off the block road draft tube. The oil filler tube uses a standard Ford breather cap.
Thank you,
Richard

Sounds right. You may have to try another Valve if the Idle is not good because too much Air being passed by PCV. Sometimes Trial and error to get right valve.