Its getting cold/heater blowing my engine!?

A few years ago I swapped engines and it seemed like a good idea at the time to remove all the smog stuff and ac stuff. Since then when I turn my heater fan on only the defrost blows and air. It gets warm so im guessing my heater core is ok but I noticed that the air blows into the engine compartment near ac lines. Whats disconnected that I need to reconnect? I dont want to take the dash out if I dont have to but its getting colder here in Wisconsin so I need to fix it fast! If anyone can tell me all the stuff under the hood that needs to be there I sure would be appreciative! As of right now I only have the vacuum line going through the firewall with the little blue valve thing on it (cant remember what its called). Thanks guys

Edit: I also checked the connections and the soft vacuum lines inside the car going to the heater controls and they look good...

I wish that was the case

Its still there. Its going from the vacuum tree to the check valve and then in through the firewall. Where does that lead to? I checked the vacuum lines on the back of the controls and there tight. Are there any other electronics that control it? I have all the emissions stuff on the passenger side engine compartment removed, is any of that for the heater controls?

Anyone?