Heck, Smokey (and others) talked about blueprinting the pump. The big thing he suggested was to check the end clearance and machine (and lap) the housing till it had the correct (tighter) end clearance. He also suggested to lap the cover and put everything back without a gasket (yes check all the other clearences, he didn't say not to, he just put the emphasis on that as it was usually on the large side and was something you could do something about).
