1970 Chevelle 396

Hello everyone. Sorry to be uploading a chevy question in here but you guys are so knowledgeable regarding mopars and I know y'all will be able to help with this. I'm gonna try to get this 1970 chevelle with a 396 started tomorrow after, roughly, 3 years of sitting. I went to see the car earlier today and pulled out the battery so that I could charge it. I had a question in regards to an open nipple. I just wanted to say beforehand, sorry for the bad pictures. I didn't think I'd be uploading a question regarding this so I didn't get a great pic. Now, looking at the pics attached, it shows one open nipple on top of the evap canister. I thought these canisters had multiple connections in which they connect to the gas tank and the carb. My 73 roadrunner has 3 hoses connecting to the canister. Does anyone know where this one nipple is supposed to route to? It seems like a tiny hose would go on it and I doubt that tiny hose would go all the way to the gas tank so I'm assuming carb. Just looking to figure this out so that I don't have vacuum leaks anywhere making it tougher to start the car. Any help is appreciated, thanks!

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