Maybe you should check with gbodyparts.com. They may have some of the interior you need.
BTW, It is not just youth stupidity. Many years ago a friend and I threw away (put it in the steel dumpster) a '73 455 Regal driveshaft, double hump rear crossmember, and other good stuff used in swaping a 455 for a 350 in the '73 to '77 Regals. I was about 45 at the time. It helps to remember that hind sight is usually 20/20.