Scorpio 5.0 Engine Swap

I'm wondering how difficult it would be to cram a 5.0 Engine out of a Ford Mustang into a Scorpio. I know that the engine will fit without much modification to the engine compartment, but the biggest problem will be the wiring harness. I know there are a few people on the internet that made harness kits for the Ford Sierra to put a 5.0 in it, but does someone know how to do it in a Scorpio?