I was able to climb up on the lift to take pictures of my LOS survivor.
Excuse the "survivor dust"
and yes...I noticed a critter brought its food on top of the manifold.
I looked at the base of the 67 4B LOS survivor and 5B NOR restored and they are exactly as the one Ed posted (Air cleaner-3)
The hose on the 4B is original and as you can see it has lines and no GM stamp
The 4B base has the smog pipe vent as well
The 5B hose was replaced in the 80's with a NOS and it has the GM and square stamped on it in yellow
The instructions are curved and the verbiage is different than what Ed posted (Air cleaner-4)
Both 4B and 5B lids are black w/white silk screen instructions and both still retain their flame arresters and have dimples. I posted the 5B lid with instructions because that is the most clearer.