Fuel/Oil spewing out of breather valve on valve cover.

If it were me I would take the opportunity to replace it with an electric fuel pump.

Boy, I surely wouldn't. I find electric pumps on carbureted non-race cars create more and bigger operation and safety problems than there are to solve in the first place. IMO the only reason to do this is as a quick fix pending replacement of a camshaft with a worn-out fuel pump eccentric.