Super six

The manifold itself is the same as with the 1bbl though those that came from the factory with the super 6 had fatter exhaust pipe than 1 BBL cars.
Someone else here recently had a thread on this, but I have gasket matched a few of these exhaust outlets where the pipe bolts onto the manifold. Don't take long with a die grinder. Makes a noticeable difference when you also have true 2-1/4 exhaust pipe made to go with that