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I wish the clowns in california would have something like that on the 57 Ford Custom my dad had waiting for me when I returned from Okinawa. They plugged the road draft tube and some other hokey crap...

Either cap the oil filler tube or put a closed breather on it.

I was referring to the oil filler tube in the first picture.

You'll also have to put a closed breather on the oil filler tube. If not done properly it will build up so much pressure in the crankcase that it can blow the dipstick out. Been there, done that.