No crank case vent. Passenger valve cover has a plug, drivers side has the A/C chrome filler cap. My engine picts show it pretty well.
From what you wrote, I'd say no c/c vent because it's closed.
I am 99% positive mine is original to the car. I have pictures of it from the early 70's.
Would it help to take some pictures of it? Or are you trying to figure out which one your car should have? Mine is a standard 326-2 with Auto trans. No A/C or California emissions. Does that help?
I used to be indecisive. Now I'm not sure. I feel like I am diagonally parked in a parallel universe. 1968 400 convertible (Scarlet) 1976 T/A - 455 LE (No Burt) 1976 T/A New baby, starting full restoration. 1968 350 - 4 speed 'vert - 400 clone (the Beast!) 1968 350 convertible - Wife's car now- 400 clone (Aleutian Blue) (Blue Angel) 2008 Durango - DD 2008 GXP - New one from NH is AWESOME! 2017 Durango Citadel - Modern is nice! HEMI is amazing! 1998 Silverado Z71 - Father-daughter project 1968 400 coupe - R/A clone (Blue Pearl) (sold) 1967 326 convertible - Sold 1980 T/A SE Bandit - Sold