How do the rocker shaft bolts go for the oil to get to rocker arms?

I'll attempt to answer this, but I must advise that a Chevy 350 doesn't have shaft mounted rocker arms, so if you are working on a Chrysler or something that does have shaft mounted rocker arms then...

A rocker arm shaft is normally a long shaft with rocker arms attached to it, that provides the pivet point for the rocker arms (newer Chevy motors).

a rocker arm is the arm that sits on top of the valve stem and connects to the push rods 'the push rods sit on the cam so when engine is running, the push rods go up and down in a timed sequence and...

Oil travels up the rods from the lifters and up to the high side of the rockers, it is supposed to run down by gravity from there.

Hold the pushrod between your thumb and forefinger feeling for up and down movement as you tighten the nut. When the pushrod has no up and down movement, that's zero backlash. If the cam has...