I agree, the ECU under the hood, the 4.2 valve cover, odd clamps on the hoses, the intake neck, and some other things seemed out of place from what I remember a renix era engine bay being like(been years since I've been forced to endure one). I think its a good bet it was a test mule at some point, why pull a nice new MJ off the line to build into this and then never do anything with it when you can grab one that was used for testing and has no other purpose.