The notch on the end of both 318 and 360 rocker shafts should point to the engine centerline and either toward the front of the engine (on the left cylinder head), or toward the rear (on the right head).
Hope this helps.
Notch on the passenger side DOWN and to the REAR. Notch on the driver's side DOWN and to the FRONT. Another way is to just make sure the oil holes face DOWN and toward the valve springs.