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You are going to have wiring problems with the ignition system. Two entirely different animals. If it were me, I would get a wiring diagram for each vehicle, and make the appropriate changes. You can possible adapt the Mustang harness and make it easier.
The 2.3 is fuel injected. The 2.0 is a carbed engine. You will need to change your fuel system to supply fuel to the 2.3. jd