Well, I'll try-but I'm about 12,000 miles away from my Q-jet collection...
The port directly above the fuel filter is used to "enable" your emissions devices. I believe the one directly over your fuel filter/inlet goes directly to your TVS (thermal vac.).
Do you have your emissions devices hooked up? EGR, AIR, TVS, etc.? Do you need to, or are you exempt? The "plugged" line to your "electric" choke doesn't make sense...:confused. I'm thinking you may have had a "hot air" choke and it has been converted to electric. If so, you can just plug the 2 pipes coming out of the intake that would feed the hot air choke-or, run a tube to connect them.
Someone having fiddled with the choke also alerts me that the plastic vacuum tube and associated seals around the choke housing may have been tampered with. My suggestion here is to get a carburetor kit from NAPA, and carefully look over the Assembly Instructions. It will, give you a fair idea of the choke housing and components. If this is a new area for you, try to find a friend or someone that has done these late 70's/early 80's Q-jets-they are kind of a bear but really quite efficient and effective, once dialed in.
Don't lose hope and squander a bunch of cash on a new carb. Depending on how many miles your carb has, it may be quite salvageable, and these were tuned specifically to the application. I like Q-jets-they DO work. Just need patience and practice...
Good luck.
Rick
McMurdo Station, Antarctica
