The OS will work but as stated earlier the threads are really fine so it will take full atv in both direction to make it work. You really need an on board needle mixture valve. For this reason alone. When your tanks are full, the weight of fuel is helping feed (the next tank) the motor. When you get down to about a half tank in flight you will notice the motor to start to leanout. This is where the remote mixture valve will come in real handy.

If you decide to run without an onboard mixture, i would set my mixture control when then tanks are about 1/3rd full. Gonna make for a sloppy rich top end when the tanks are full but as the flight progress it will get better. USE LARGE FUEL TUBING. yes medium tubing will work, but it is easier for the fuel to flow through the larger fuel tubing causing less fluxuation due to fuel weight.
Hope that helps some
sean