The dakota was really designed around the 318 magnum engine, IIRC that engine is shorter than the om603. I know the 6 cyl 4.0 jeep motor doesn't fit in the dak or durango for ****.

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1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard Parts Fodder
1987 Mercedes-Benz 300D Turbo, The diesel daily, 30mpg in style.