RE: The unofficial Home of all that is Nitro Vee...
doesnt look like tower has then, but the have s-loads of others, any carb for a larger airplane engine that will fit would probablly be good, because the dont limit the airplane carbs like they do on cars for racing purpose, and it looks like the carbs have changed(dunno if they are still same size though) OS engines run nice if you are familiar with airlbeed cabrs which most os plane engines(such as the LA series use)...I basically looked for something reliable that just happen to boost the power...