Drill a ~1/4" hole in the cam plate in front of the pass oil gallery (thru the round rough dimed sized nub) and a 1/64" (.015") hole right behind it in the mini freeze plug capping the front of the horizontle main oil gallery (pull the plug and get a new one & drill/deburr it then drive it in. This'll put a pressurized squirt onto the chain/gears/eccentric as opposed to the 1/8" drip in the OE top pass bolt. High zinc oil & check that the pump is not binding/arm is square & as said a good eccentric