looks like you have a good start on it. My concern would be the rails. they made need to be patched, and using a V8, and modified at that, BEEFY rails would be a good idea. Some guys have even using thick steel runs of pipe that are U channel . I attached pics of my car and some of the patching done. MY car had 45K original miles and 30 years of its life sitting in an airplane hanger and I STILL had to fix the rails. I attached a close up pic I got from one of your pics, and it already looks like it needs attention. here is a link to watch :