Six pack on 318

Horsepower hasn't a thing to do with it. Nuthin, nada, zilch. None of the original 6 pack small blocks were rated or produced that much. What hogwash. It's all about flow and velocity. You get a good set of heads on that 318 with a good flowing matching intake and a good pair of free flowing headers and that 6 pack 318 will be a total street terror. Since the six pack setup is vacuum operated, it's only gonna feed the engine what it asks for. You'll probably never flow the maximum rating CFM that the six pack can flow. With a good matched induction, exhaust and cam, it will be impossible to have too much carburation because of the design of the vacuum carbs. If you can find a good, uncracked set of the 308 heads, stab some big valves in um and chunk um on it. It'll run like gangbusters.