Apologies to Carnut, but with its distributor mounted vertically at the front of the V, I think #1 could be a small-block Ford Windsor engine.
From the ribs on the top of the air cleaner, and the lack of a breather hose from the filler on the valve cover, I don't think it's the later 351 cu in engine, so (as Carnut said) I think it could be the 289 cu in (4.7 litre) version introduced in 1963. It was used in the Ford Galaxie, Falcon, Fairlane and Mustang, and probably others as well.