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A word of caution about blocking too much air to the 4.0, the Jeep inlines tend to get pretty hot. Particularly when they are loaded down.
If you ballance blocking air going into the engine compartment with better exit flow you might be able to improve cooling and aero. On my CJ I cut a large vent out of the hood and it dropped temperatures by about 10F. Its not pretty but it is effective.
The aero on these are so messed up that a boat tail would likely have no effect. I experimented on a windy day with a stick and plastic streamer seeing where the air flows (bikini top only), and about half way down the sides the air was pretty turbulant.
Personally I would go with a smooth sloped skid plate to divert the air below the steering lingages and front axle. They also make "tummy tucker" center skid plates that should help and give you mounting points for lighter cloroplast. I would suggest a rounded air diverter on the front of the center skid to block air between the skid and body. Leave the area between the front axle, engine and body open for exit flow from the engine compartment. Behind the center skid install another to divert the air down below the rear axle. Some cloroplast from the bottom outboard of the frame to the bottom lip of the body to cover up the body mounts.
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