
#6 on left and #5 on right. These are obviously broken down for rebuild, but you can see that the hole in question is plugged.
The end carbs have the fuel and air rails plugged. The middle carbs are open on both sides.
SO looking at them as though you are sitting on the seat, the top rail (air), and the bottom rail (fuel) are as follows
2 and 1 PLUGGED on front. Connected to 4 and 3 on back.
4 and 3 open with tubes to front carbs, and Ts to rear carbs.
6 and 5 Plugged on back. Connected to 4 and 3 on front.
Hope this helps. Bottom line is your pic shows it the way it is supposed to be.