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i did grinding on the oil pump housing as well as the timing cover. Unless you're going solid roller with extreme spring pressure, I would just buy a quality single roller with new gear set and call it a day.
Here's what I did to get mine to fit, spot-faced the four pump retainer bolt areas with a router bit in my drill press (poor man's mill). After this, it fit tight w/o a gasket so there's plenty of room with the gasket installed.