just got me a '67 Barracuda

1967cuda said

Yeah, I wondered about that. There's no nipple on my oil cap. But the filter material in it is oil-soaked. Does that mean either the air cleaner housing or the oil cap have been replaced from another model /6? Should I be concerned enough about that to restore it, if so?

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I was just looking at my 65 parts catalogue and it lists air cleaners and oil caps for the slant 6 and V8 2 and 4 barrel with and w/o the hose nipple. I think that up through around 66 or maybe 67 (except in CA I believe) the factory oil caps (both painted and chromed) did not have a nipple. I parted out a 66 Dart GT and it had the small slant 6 air cleaner and a factory black oil cap w/o the nipple. My wagon was a CA car until I acquired it and it had the larger air cleaner like yours as well as the factory oil cap with the nipple. I think that the system with the oil fill cap nipple, hose and air cleaner might have been mandatory in CA as part of their smog packages. Both my painted and chrome factory oil fill caps have the work "OIL" on them twice - one is backward from the other.