I am using an oil pump cover from a 73 engine with about 105k miles to put on an engine that was just rebuilt. I resurfaced the cover using 600 grit and a flat surface just enough to get the old gasket off and flatten the mating surface where the gasket goes. There is some scoring in the cover, not really deep but I don't have a point of reference so I don't know if it's too much. I can also see some wear on the sides of the little piston that relieves pressure. Should I be considering an new pump cover?