273 rocker shaft ?

I'm going to install my adjustable rockers this weekend and want to make sure I'm putting the shafts on right.No notches on the end of shafts like on my nonadjustable ones.The shafts I got with rockers are plugged at the ends,is this better?Forcing more oil thru small oiling holes.I guess what I want to know should the small oiling holes face up or down?