Connecting PCV for the first time…is this nub at the back my carb where I’m supposed to connect it?

You should connect it to the spot that has a hose with a bolt in it. That goes into the carb spacer so there is no nonsense going on with it.

Where does the brake booster plug in? Don't put the PCV on the same connection as that and don't put either of those on a runner directed to a single intake port.