WTF at the "why a Jeep?" Seriously? Why the Charger or Challenger? Both are fat pigs of cars and are not exactly adept handlers (so people going on about the weight are just...I don't even know what to say, those cars weigh almost as much as the people going "WTF, it weighs 4500lbs!"). Plus both have serious traction issues with this engine, which 4WD in a Jeep helps remedy.
Some of you don't seem very familiar with the Grand Cherokee in general, and like others pointed out it's actually probably the best fit for this engine. Couple that with modern traction and stability systems, and it should be fine (but as with literally anything in the hands of an idiot can lead to trouble).
Now if you're going very high speeds and doing sharp maneuvering it does present somewhat of an issue (but that's true of all vehicles, although SUVs are more likely to roll, and if I remember correctly this generation of the Grand Cherokee actually failed the "moose test"; although I don't think it rolled over, it just wasn't fully stable, and I'm pretty sure that smaller Porsche SUV failed it as well), but it's not that huge of a concern.
If this gets made it will likely sit lower than normal (will be curious if they put the air suspension on it or try to lock it down to a lower ride height and stiff suspension for handling and stability purposes).
Here is why I think this might be a bad idea:
https://www.youtube.com/watch?v=bHReKA1HAEM
You're right, no car has ever crashed on race track!
Torque at the wheels is dependent upon gearing, while horsepower takes RPM into account. Horsepower is a more useful metric when you're looking at what happens at the output shaft.
A simpler way to think about horsepower and torque is just that torque is the actual force, while horsepower is how quickly that force is applied.