Well it would almost be like running a 12T clutch bell as for every tooth on a clutch bell is about 3 on the spur.
Stock ratio: 3.5385
Yours: 3.6923
So at any given rpm when there is no tire spin and the clutch is not slipping, the tires on a stock car will be spinning a little more than 4% faster than yours...
So if you're at 35mph when you lift at the end of the straight, the stock car (in perfect conditions: no slipping of clutch or tires) will be going a little 2 mph more than your car, so the gear isn't making 'THAT' big of a difference. It should be down to tires, fuel, motor, tune of the motor and how you enter/exit the straight.
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