As I see it:
- Oil within your intake should not be considered normal & that needs to be diagnosed and remedied first. But keep in mind, your valve stem seals affect crankcase vacuum which effects CCV operation.
- You should not have excessive vacuum within your crankcase which would be evident while pulling your oil filler cap.
- If you don't know the repair history of a vehicle, don't jump to the conclusion it needs valve stem seals. There's a possibility the previous owner had the seals replaced and you may just be looking at a vacuum issue.
- If you're going to do valve cover gaskets, you may as well do the valve stem seals while you're at it.
- Your air filter needs to be clean.
- Carbon build up on piston tops from gallons of oil being burnt will effect your emission readings & visual test.
- This CCV system is a poor design and is easily defeated, so adding a catch can will help.

Heading out for breakfast, so I'll add more if I think of it later.