during the rebuild, make sure the end plates on the oil pump are smooth and not gouged. Sand smooth if needed. Make sure clearances are minimal. At startup, make sure you have about 15 psi pressure at the gauge. Make sure you have oil supply thru copper tube to the rocker arm. I think i would buy a "good or decent" rocker arm/ shaft setup off e-bay instead of shimming or copper bushings on the old part. If you reamed out the holes and made a new shaft .030 inch oversize, i might go along with that modification.
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