Brushless RC10GT

I really like both your setups. The batterys I run are the 2300 1100 mah - a123 ,3s2p and 3s3p packs that I made. I have packs of both mah cells in each of these configurations. I to am looking for 35-40mph, and 25 min run times but the mamba max esc limits me to 3s. So a high voltage setup is out but would switching to a higher end, more efficient motor get me closer to this goal without purchasing more expensive batterys. If so what gearing for this speed is needed, have a wide selection of spurs not so many pinions would need to do a little more shoping. One last thing I am still not clear if the Revo mount can be purchased as a set and at what cost.