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It originally had a 4.6 romero and now has a 4.6 windsor according to the tag on the valve cover.
Those terms do not mean anything to me. Of course there are a lot of things I don't know about.
What I do know is if you have a combination of engine/tranny/truck that was never offered by the factory, you will never find a harness that's going to fit perfectly. Sorry I can't be any more help on this.
Well, Romero and Windsor are the town where those particular engines were made. They are basically the same engine. As far as I know they are exactly the same engine electrically so in theory I SHOULD be able to find the original harness for the truck and it should work fine......except I can't find the harness. So I am starting to doubt myself.