Sounds like a fun project.I love those 4.0L's
.My dad has one in his 2000 Ranger.Anyway,I just have 2 minor questions..
1) How do you plan to hook a C4 to this engine?
2) Wy not go with something easier to swap in,such as a Ford 302 or Chevy 350?These will produce more power and will be 25 times easier to install,especially the 350.
But,if your heart is set on the 4.0L,check out the following website.Last time I looked,they had tons of wiring diagrams for 4.0L's.
Hope this helps.