"It will probably be expensive, but why not buy a 5.0 engine harness?"
Trust me, do this or pull one from a yard. If I were to do a E.F.I (8 injectors) I would
use a 86 to 88 302ho motor and harness, but they are hard to find.
Check these guy's out and tell them Slim from Va, sent ya.
http://www.prestigemustang.com/