[bobcowan]

Yes, there is. The rough intake ports help keep the fuel in suspension until it gets to the pocket. If you polish that up real nice, it will make the engine run worse at low rpm's. If you're using EFI, that's not an issue.

Also, be very careful about how tall you make the intake ports. If you're running big heads, port matched to a 1262R gasket, some manifolds can't be ported that big. Before touching the manifold, set it on the mounted heads and get the basic fit. They do a gasket match. Without the carbs/TB's, you can look right down the ports and see how they fit together.