My 1971 302 has a pcv valve in the hole that is shown on the oil filler cap in this photo. My factory PANCAKE CAP HAS FILTER MATERIAL INSIDE IT WITH THE PCV VALVE. It is where the brass looking fitting is in photo. Then hose goes from top of pcv valve to inlet on the carb spacer which is open to the intake. The passenger valve cover has fitting close to the air cleaner housing & it connects there. Both hoses appear to b preformed factory.
If you will notice in your first photo there is a black plug in the air cleaner. This is close to the valve cover opening for a reason, this is where a short hose should go to the air cleaner with the little filter holder inside. Not to the carb spacer/intake manifold. Matter of fact I just remembered mine has a FACTORY plastic tube that is permanently connected to the factory valve cover on the passenger side that the hose connects to.
The drivers side valve cover should have a oil fill cap with the PCV valve, and filter material in it, then connects to the carb spacer which connects to the intake manifold. All preformed hoses were available from Dennis Carpenter. I also just noticed ther is a slight gap where you have your PCV valve. this because someone has removed the FACTORY plastic connector tube i mentioned from the shown grommet there. That hole is for the tube not the PCV valve.
I apologize for the long winded explanation, and it being a little repetitive. I partially skimmed through reading this several days ago when I previously commented. I am posting all this because I came back to read the whole thread because I just NOW need a PCV question answered !!! I read this before I posted a new thread, & sure enough I found my answer here ( I think ) about only using a breather in valve cover instead of going through the air cleaner housing !!!!!!!!!!!!!
BUT now I just realized on my valve cover to install a lone breather valve I would have to remove the factory plastic tube & I do not want to do that. May get a another valve cover & save the factory one............
SOOOOOOOOOOOO I hope Y'all understand...........& this helps.............. I bet it took me almost at least an hour to type this & about 10 edits so do not b 2 hard on me.........ha
LAST EDIT........PCV valve should go in the hole where the brass fitting is on the Drivers side valve cover. Where you have the PCV valve, there should be a plastic tube connector in the grommet permanently connected to valve cover, that connects with hose that connects to a filter holder inside your air cleaner housing. The plastic plug in air cleaner housing in the first photo is where the hose should connect..........
NOW IT FEELS LIKE 2 HOURS OF ........"GOOD NITE.............GOOD NITE...........GOOD NITE...GET HIGH & .........." Bob Seger concert quote..........

 

Thx everyone for the pvc education! Its been a good week because a learned a couple things. The pcv system is more important than what I thought it was, I alway thought it meant pollution control valve, which it is somewhat, but makes sense keeping oil cleaner and burning up excess fuel mixture and crap. Lord knows these FE engines would burn up road tar and spit it out like dip. Second, make sure you read everything carefully when ready these threads because by the looks of it 302's are totally different than 360's.

So I decided to install the factory spacer on top of the phenolic and extend the kickdown. Thx to Jefffafa, Holly extension bolted on with minor modifications. I want to keep the original breather but eliminated the cowling on the manifold to the breather port intake. For the breather imput I may make up a small extension or filter of some sort so it looks complete?

Now just wait for spring!

 

My mistake was going by Mr. Hamilton's photo with the plugged version of the air cleaner housing instead of the ORIGINAL THREAD STARTER. I do apologize........
We all contributed some useful info............if you ignored the smoke coming off the keyboards..........

 

Just throwing in my two cents as I struggled with my PCV system a lot during some recent engine work. When I moved from the stock Autolite 2bbl to a 4bbl, I no longer had access to this PCV port. My solution was instead to port my PCV to the power brake port on the back of my new carb, as they are the same vacuum. With a new air cleaner I could no longer run the PCV into the outside of the air cleaner, I created a hole and placed a grommet and elbow on the inside dish of the air cleaner. I ended up having to run two different sized hoses, 7/16 out of the passenger valve cover with the valve, and 5/8 out of the driver. Both sides have breather caps because I don't think it hurts at all.

Driver side into the air cleaner

Passenger side into the back of the carb.