oil pressure and adjustable hydraulic valve adjustment

after the oil pressure was boosted with the replacing the distributor oil plug. Could this be the case?...............My machinist says ...........between $800 and $1450.

First off... WHO left the oil plug out? If it was your Mechanic/Engine Builder. He bought the problem. You should not have to pay him ****!

Any oil pressure related issue should go right back to the guy that assembled and left a condition that allowed for damage..