273 rocker arm adjustment

Yes I believe the notches are to ensure proper orientation. Im still learning or at least trying to LOL. I know with my 67 273 it has adjustables as well.
I would think ALL of the lifters should push down/compress somewhat. Take a good bit of effort. Soak them all in oil BUT keep them in order so they go back in the right lifter bore! You cant mix lifters up once its run or kiss lobes goodbye. But that could be the case anyway.
hmmm, interesting, so the notches are used for correct orientation is that so the oil holes line up with the rocker shafts? it looked like the holes were lining up properly. what happens when they run backwards, is that the galling i am seeing? (btw not sure why i started putting a k in front of notch, lol)

Another troubling thing i came across...should all the hydraulic lifters move when i press on them? some of them dont push down....(now that i have both rocker shafts off, i went to each push rod and push it down with my hand and some of them compress and some dont)