To my understanding everything on the engine was Orange. It was painted as a completed unit.
The "magic decoder ring" for engine parts is the Assembly Manual; if the part in question shows in the Assembly Manual with a part number, it was installed at the assembly plant and will not be orange. If there's no part number in the A.I.M. and it was part of the engine assembly as shipped from the engine plant, it was painted orange (except exhaust manifolds, which were installed after engine painting, and aluminum valve covers and intake manifolds, which were masked off).