The oil pumps up the pushrod, through the hole in the rocker, down the rocker, under the shaft, adn down to the tip. If you deviate from stamped steel stuff, you will/may have to do some other work. But in terms of stock stuff, it's a bolt on.
Every time this comes up I think of adjustable rocker not stock rockers...that is why I posted how does the rocker shaft get oil...
with adjustable rockers you are going to need to figure out how to get oil inside the shaft...splashing oil is not going to work on adjustable rockers.
