RE: Walbro initial settings?
That will work. Two turns is likely to be pretty rich, but it should start and run so you can begin tuning. Keep in mind that with these carbs, adjusting one needle will affect the other. So you have to go back and forth checking the high speed running mixture, the low, the transition, etc. several times before you can consider it dialed in. Once set though, you will probably never have to change them as they don't need adjustment for normal weather changes, etc. like glow engines often do.
AV8TOR