Need help identifying the vacuum lines in picture. What does large main hose on top go to(this is a picture of one I found online mine has a broken hose) I have it plugged and it’ll run rough, unplugged and it’ll shut off on me.

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the big one goes to the power brake booster.

 

Diagram shows line connects from passenger side of carb though.

 

it would be up to you to verify if your setup is different than the diagram. that is how it is on most vehicles i have worked on.

 

Ok if I do how you recommend (which I’ve seen a bunch of people do this for way as well) can I just plug the right side of carb?

 

ya just install a vacuum cap or block air from going in there and it should be fine.