The PCV valve wasn't shown in the AIM because it was part of the engine assembly, and the first Parts and Accessories manual it shows up in is the November, 1967 P&A 681A (See attached). As you can see, it covers all V8 engines for 1967 and 1968 except the Z28 and the L35.
It's always best to find a P&A manual as close to the build year of the car as possible since even a year later part numbers can change!
And by the way, I trust HBC as far as I can throw them. (My opinion only)
Ed