Eclipse, if it really does make 420 wheel horsepower that means it's making roughly 500hp at the crank. So the Mitsu and the Truck are making similar power, the Mitsu has the benefit of carrying about 2,000lbs less weight and has AWD to help with traction.
Just based on those facts, the Mitsu would win.
The only place the Truck maybe able to hurt it is if it's got large tires, and is geared up, having enough traction out back it might be able to hang with the Mitsu till about 60mph. Despite the weight differences, Trucks can still move out... Torque is your friend. Big Block Chevy's make good torque way low in the rev range, basically off idle...
Would be interesting to see nonetheless.