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I looked up pictures of Y block water pumps and there seems to be a couple of styles, one for trucks apparently has a heavy mount with two holes off to the side, the standard type does not have anywhere that I could see where your plug would go...unless it is the female pipe threads for the heater hose nipples. And 5/8 hose usually uses a 3/8 pipe thread. Do you have a picture of the location?
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.