Offenhauser 4 barrel with what carb?

Mopar worked up a 225, Offy manifold, and Holley 390 cfm combination. The details of it are in the Mopar Six Cylinder book. What the set-up does not elaborate is the camshaft or exhaust type they used. Also, I'm not sure how old the recommendations are. Do they take into account the ethanol in most pump gas? I don't know.