This one has me going in circles. Motor is a mid 80's low compression LA 360. Good oil pressure averaging 70 psi cold start up. I have tried several gaskets and adhesives, but I am still getting significant oil leaking from the rear of the driver's side valve cover. I even tried adhesive on both valve cover and head mating surface. Stock rocker arms and shaft with notch located front of motor and facing down. I have tried two different valve covers with the same results. Any suggestions?