I'm not sure about your 1972, but my '81 vacuum layout has the PCV line T'd to the charcoal canister.
Intermediate CJs have the PCV hose tied into the carb with a 3/8" hose. Mine ties into the back of my Holley carb and did on my Motorcraft carb as well. I have a 90 deg elbow on top of the PCV (one that I found would work from Autozone) and the 3/8" hose inserts into the elbow nicely.
I see what you guys are saying. What's confusing me though is my carb has, what i think is the pcv port on the front and i have a hose connecting it to a pcv valve on the forward section of the manifold. I'll get a pic of the hose going to the pcv valve on my engine later but here's a pic of the carb i have. http://www.camaros.net/classifieds/data/5/IMG_3254.JPG
I got pictures of my setup and the PO actually had a bolt capping the pcv port on the carb. I'm gonna order the pcv valve and when it comes in I'll get the port insert for the carb to make sure the hose fitting is the same size.
I have the same year and engine. Make sure you get the right PCV as they are tuned for the engine they sit on. Also, that rubber grommet is no longer made, but this one fits....http://www.summitracing.com/parts/rnb-42056
Steve, I forgot to ask you, will the grommet from Summit that you posted fit on my edelbrock manifold or do they differ in diameter depending on the manifold type?