i removed the fuel tank today on my 80, and it sure does open a lot of space to work with. Not sure with the bend in the tube from the filling point to the tank. but i would venture to guess 'maybe'. i can look tomorrow, just pulling back will clear the frame cross member so maybe. i would try it if i had to change my filler neck, versus cutting it!
i guess the other variable is if the body has a lift on it or not.
It wasn't too much of a task to remove the tank, so it's worth a try.
i was surprised the long filler tube had a small tube inside of it. I thought the smaller 1/2 inch-ish tube was the vent, but a small 1/4 plasic hose was inside the larger filler tube.