Ugly Bastard.. 67 Barracuda Notch
Thanks guys. The frame is solid, I've checked it over. The floor looks worse than it is. It's mostly scaling and surface rust, with some small holes here and there.
I filled in a few holes I had made from burning through, and then smoothed down the welds to match the new trunk pan to the old metal. I then seam sealed it, and primed it.