Good points. I believe notch on shaft faces down and to your left when hanging over the fender. So drivers side would be down and front, passenger side would be down and to firewall. Check the adjusters to see if any have loosened up. They are an interference fit and tight to the rocker. Unless they have been modified with upgraded adjusters and locknut.
Side note ....I just checked my adjustable rockers and shafts for my 340 build....bo notches? Sorry for the hijack.
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