If you have the aftermarket real thin shims which I think I can barely see in the pic just mix/match them ANYWHERE along the shaft as needed to laterally align each rocker arm tip with the valve stem. Slide em on there as needed to reduce the clearance till you have ~.015" sideways clearance per pair (of rocker arms). As said shaft end notch goes down & to the rear on the pass side & down & to the front on the drivers side as this tilts the hidden bottom oiling holes in the shaft slightly (& correctly) toward the valve side