Gas Tank Vent
Yep it does! If I see that correctly I would you the line closest to the front of the car.
Also, I've thought of something else.. Does the 76 filler tube flange mount inside the trunk? I installed it on the outside and that was because that is where the gasket was stuck on it... If it should be inside the trunk I will have to drop the tank because the tube is so damn long compared to my 71