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Around here you would be looking for the proverbial 'needle in a haystack' if you are in a hurry. My suggestion is take your time, search several states, not just locally. Be advised, if you are looking for a 7.3, you are going to pay a premium price for it. You should be able to find several more 6.0s than 7.3s that are low mileage. Subscribe to Carfax. Check out each one carefully. Get the owner to send you LOTS of pics and again, take your time if you have that luxury. There are deals to be had, you just have to be patient. Keep in mind that most X's over 75k will have to have ball joints which can be pretty pricey if taken to a dealer. I didn't, a friend of mine did it for a fraction of the cost. Most will want to upgrade the springs to ride/handle much better. Search V/B mod on here for that upgrade. IF you find one in the shape you are looking for, you won't be disappointed. Most on here feel the the X is the most capable SUV on the planet. Good luck in your search.
Mods will want to move this. Have no idea how it ended up in the 6.4 section.
jamehug, I think this is probably not the best place for you to get a great response. The Excursion was never offered with the 6.4L PSD, and so unless you're looking for a modified one you will probably get better luck elsewhere.