I've got a 69 wildcat (with the big rear end no one makes parts for) and am trying to figure out the easiest way to put one in there that is out of something with the same upper and lower mounts. I can't find anything that points me in a direction.....like a 68 GTO or a 70 GS to name an example. Any help would be great. I'm really trying to not spend $7k on a custom Currie 9 inch.