I had to google this, I wasn't sure of the look. What a beautiful car! I would be prepared to be vocally assaulted by the purists.
I don't know of the problems you might encounter with the stock running gear but I would look into the 70's Toronado or fwd Caddy running gear. It may be a tough find. There is a Caddy grave yard in the Lancaster, Ca. area, maybe a good place to check in to. Good luck, keep us posted, this is definitely one of a kind project. Dan