'65 Gas Tank Installation: Filler Tube before or after?

see my how to on this. IIRC you unscrew the 3 screws and twist and point the filler tube opening toward the from of the car, and you slide the tank up onto the shortened bottom of the tube tht is pointing back a little while maneuvering around the spare tire well.
65 Barracuda fuel tank R&R
"..Once again, rotate the filler pipe to a position that will allow the least amount of filler pipe to be showing under the car, I got it up into the fender with the flange pointing back so there was about 3" showing under the car and to a position that was pointing down and as far forward as possible. This allowed me to just hook the greased filler pipe into the flange and wrestle the tank up into mounting position and hook the frame with the strap and fully unscrewed tensioner. If the filler pipe is not separated from the fender fill location, the fill pipe is too long under the car to fit the tank flange as the tank cant get into that position due to the spare tire well. Now you can grab the filler pipe and twist and push into mounting position and screw the 3 screws in.."