Maybe that is true in the states but in Aus we only had clevelands from about 1971 all in 4 barrel form with 351 and 302 but they were assembled locally with a hybred cyl head that was half way between a 4V and a 2V open chamber head and they were gas guslers with poor performance. I had cop cars for years and my VJ Charger with 265 hemi 2 barrel four speed was a lot faster than my Falcon 351 4 speeds and used half the fuel doing so. My charger ran 15.7 stock and just by putting a 600 holley and extractors( Headers) it ran 14.7 qtrs all day long.