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Length is an issue. The Canadian M-37s had bigger engines (still flat head in line sixes, but slightly longer) and they had to move the radiator forward. This means you will also need a longer hood, etc. Measure the Jeep 4.0 and see if it will fit. You will also need to think about changing...

This makes it a little easier to make suggestions, now that you have defined the performance envelop. The Canadians used a 251 (265?) c.i. engine in their trucks with a different transmission. I believe they had a higher top speed. The real problem you face is not the engine but the rest of...

Welcome to the site! You may break things. If you make the M37 go fast, you'll find that the brakes are inadequate to stop your truck. You'll also probably need a different transmission and probably a different transfer case because the stock one may over heat. The gearing in the front and rear...