Carter ball and ball

[Crisjr14]

Wanted to see if anyone can help me on these dual carter single barrel carbs so on the back one I have my vacum advance line as pointed out in picture attached  but I just noticed the front one does not have anything coming out from that port question is do I buy a plug and block it off I did notice there is a hole in there so don't know if that will make it not run right with air escaping from there or is there a way to run a split vacum line or should I run just only one vacum from one carb and just plug up the other one thanks for any help 

[Sam Buchanan]

Plug the unused port. It is 1/8" NPT thread, same as a common pipe plug. Air won't escape from the open port, it will be drawn in by intake vacuum and create a lean run condition.

[Crisjr14]

Thank you Sam going to get plug for it today maybe that's one of the reasons I could never get these dual carbs in sync and run correctly lol again thank you