This is the intake. It has 4 bolt base with 1-7/8 by3-1/4 bolt pattern. I believe they used 2 barrel Rochester 2 GCs or 2 barrel Stromberg carbs on this manifold. Just reading on Internet various sites is why I think that. Thanks. Jim. Also my 270 has "H" head with big intake ports, no reducers required for intake. Thanks. Jim