O.K I'm back again,
Your High Speed Needle should be set at 3 turns out from closed position.
Your Low Speed Needle should be set 4 turns out from closed position.
You can find the PDF for your engine if you type "Losi 350 engine settings" into you pc, there is actually quite a bit of interesting stuff to read including the truble shooting if some thing goes wrong.
Hope this helps a bit. Have fun dude.[8D]