Yeah it COULD be possible but i cant imagine a 300ex doing 76mph with 18in tires.Im running 14/34 gearing and i can blow it up in 5th if i wanted and i dont have a rev limiter.I cant say the exact speed though but with the bore kit and fcr carb etc,it maxes out pretty quick.the 18s arent the tire of choice for high speed runs,it works for the track though.