That's kinda what I am saying about Stock 49's Chevy. 2.56 gears which what he will have in overdrive are pretty tall especially with tall tires in the 30 inch range. The fact that he has a fastback will help some, but I would imanigne that a 49 Chevy has a lot of wind restistance. 3.55 gears, however with those same tall tires would unload his engine enough to let it wind out to max power in high gear. 100 mph in overdrive with 30 inch tires would be 2867rpm. Put it in direct and the rpm becomes 3976, much closer to the max power RPM of his engine. Don't worry Stock 49, we haven't raced your Chevy too much! Ha ha. Jay