Can Torrie verify from looks of your LPFP if the one from the Supercharged Shelby Mustang, or from Ford GT would work. If the Walbro would fit, you might just need a different plug that you can wire into Ford's loop. This is an issue with G8's using the ZR-1 pump. Works with the proper plug.
Also... may just be off base... This is black hole technology for me, but like daily diets for some.