Since the tang has been moved, float level may not be an accurate indicator of fuel level. You might consider making or buying a float bowl plug with a hose barb in it to inspect fuel level directly with a sight tube (clear hose). With the carb level and connected to a fuel source, fuel should rise no higher in the tube than the lower line of the carb body, and no lower than 2 mm. below the line.
My 20 year old Sudco Mikuni Tuning Manual has instructions for level adjustment on independent float systems. I just checked the current (5th) edition of the manual, and found that some editorial twit had seen fit to delete that information. So it goes....