1967 Barracuda Fuel Filler Neck Trunk floor gasket

The metal work on the entire car is done, this was discovered when I tried to put in a gas tank. I guess I will have to cut what I have to cut, and then add support where needed. I added torque boxes and put agitational metal in front of the valence that connects the 2 frame rails together. I will take some pictures when I get into it. The picture in the top of the post is what the floor looks like.