Check the Chassis Service Manual we have for 1967 in the Reference section of this site. There is a complete section on the 225 including the rocker arms and oiling system. There is a specific procedure for installing the rocker shafts according to the notch on the end. It can be backwards if done improperly. The picture of the oiling system for the 300/340 in the same manual is very similar to your 225.
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