I don't know if this will help but I ran a 318 in my Dart with 3:91 gears and it was pretty quick. It had a Summit Racing cam and a 4 speed. People used to think it was a 340, but it was just cam, stock heads and Holley 4 barrel. I never 1/4 mile raced it so I don't have an E.T. it was purely a street driver.I really think the gears had something to do with it though :)