Ive almost completed this, have the carbs mounted back on and almost all the lines hooked up.
I have a question on 4 vacume lines. They are located under the carbs on the engine, one for each cylinder. The lines are these.

Now whats confusing and there are 4 spots directly above them on each carb, and 4 spots for them on the air box

Carb spots. The 4 nipples under the bowls.


Where do those vacume lines off the engine go?

If they go on the airbox. What goes on the 4 nipples on the carbs pictured?

 

The 4 nipple's do not need a line they are the float bowl overflow outlet's. you can choose to put a line on each one & run it underneath the bike, but it is not required they are simply there incase too much gas get's into the bowl it will exit those nipple's instead of into the engine which would floud & die.Or if the bike get's tumped over on it's side they will leak.