Kris,
The 5-speed is the only way to go for sure.
I am using a Ford truck bellhousing, I am not sure but it is the years that used the hydraulic setup. I am using all of the pieces that go with it from Ford but there are proably a few aftermarket parts that may be better.
I am sticking with Ford because of parts availability, when Ford stop making the parts I need I will look into aftermarket stuff.
I would think that a truck with a 5.0L in it would have everything you needed. The jiuce clutch make it easier to set it all up. I have not instlled my resorvior and clutch pedal parts but will shortly, I hope.
Using existing pedals and clutch plumbing will certainly make it easier. When you hook it up, double check the throw of the clutch fork. Make sure it is completely releaseing the disc, before your start the vehicle; unless the rear wheels are in the air. Wouldn't want to see it take off on you. Another thing if you have not already taken care of it; the clutch start switch. This switch is a great idea for not starting the vehicle in gear but for starting the vehicle in gear and on the side of a hill then it is a curse. My vehicle will not have it, I can't tell you to take it off your vehicle but off-roading it may asist you if you do not have it.
Is your Pedals and reservoir for the clutch stock for the Xplorer/Navajo. My setup is from a Ranger, I am hoping it is the same.