You are trying to squeeze alot of tire/wheel under a Fox body, aren't you? Sounds good to me, but the 10's are going to be tight. I cannot say which spindles/axles to use, but Saleen used to do this conversion to get 5 lug wheels on thier rides prior to the stock '94 Ford conversion. You will have to rotate or possibly remove the quad shock in rear and do lots of research.
Try searching for mustang 5 lug conversion and see what you come up with. Seems to me that comes up with some good links.
Good luck. Jazzer
