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Sure...it will probably bolt right on, but if you want it to match up properly, you're going to have to swap a LOT more than just the front end - the Navigator has different side trim that starts at the front end, and continues completely around the vehicle. Not to mention the hood, bumper, fenders, etc. I wouldn't do it. It'd be less expensive and alot less trouble just to buy a Navigator if you want that look.
Yes if just bolts on but there is a little more work involved in making it look good.
I have done it 2 times now, look in my gallery at my 2002 f150 supercrew.
I just finished the conversion and I think it look really trick. I can give you detailed help if you are interested in doing it. I also know the part numbers from ford that you will need. I even have a few parts left over from my last couple of projects. I also had a matching 1999 Navigator that was the same color.
Good luck.