oil passage ???

As yoou may well know - notch on the end of the shaft goes to the front on Drivers side and the the back on passenger side - small holes down. Oil comes to the rockers shafts in 2 locations - 2nd bolt back on Drivers side and 4th bolt back on passenger side. If the shafts are scored/gauled you really should get new shafts and rockers as the gauling will likely continue even if you get the shafts in correctly. make sure the 8 small oiling holes in each shaft are not plugged too.