[tubman]

I would think that any engine of Mercury size (255 ci) and up would benefit from a larger carburetor. Mercury had the larger four bolt Holley's from the factory. If your going for a totally stock restoration, it's one thing, but for a driver, I would think it would be a benefit. I have a Rochester 2G on a bored out Merc manifold on the warmed over '51 Merc in my car and am very satisfied with it. The Mercury engine, a set of Edmunds heads, a Mallory dual point and the Rochester carb gave a noticeable increase in performance in my case.