If you have a K&N filter clamp on flange adapter set up, and you should if you dont have filters that clamp directly to your carbs, with no lid on the air box. I'd suggest bout some 320 mains, clip in middle position, stock pilots and adjust your air screws, bout 1 to 1.5 turns out. This should be a good starting point, provided you have STOCK PORTING and STOCK CARBURETORS. Also pending your temperature outside and elevation.