you can gain much more than 3mph, more like about 10 if you gear to where you cut down on wheelies, if you keep stock gearing, impossible to keep the front end down but still will get about 5mph more than the 3.3
The most common setup I believe is 17tooth clutch bell and a 36 tooth spur gear, this is if your REVO is pretty light, if you're on the heavy side then try 16/38