If you metal pinch gone the best way is to WOT rich(cyrul) breakin method, but id suggest changing the rod at two gallons.
Why is everone so worried about not opening up the engine until two gallons? Ive run allot of engines and they all seem to run faster when I break them in hard and fast.I could care less if I got seven gallons from a $200 engine, as long as it makes it through two or three big race weekends I got my moneys worth.
I asked about the LSN needle because the Gos needles are still in the spraybar at full throttle, I belive closing them off with a closed carb will deform the spraybar and then your tune goes out the window.