Is my EVAP charcoal canister supposed to be open at the bottom or sealed?

What is your question?

The charcoal canister on my 1970 Pontiac Grand Prix had only one hose connected to one of the three ports at the top of the canister, when I got the car. A strong smell of gas emanates from the car when I park it in my garage. Additionally, there is no real solid bottom on the canister. It is open to the air and I can see the white canister filter that sets against a screen that is further up into the underside of the canister. Is this normal and where do the other hoses from the ports lead to?