Our 3.5 litre V-6 engine is NOT from a V-8 engine with 2 cylinders chopped off.

It is an entirely different engine. Until the Chrysler 300 & Charger came along, this engine was only used in front wheel drive applications.

The 3.7 V-6 engine used on the Jeep products is a chopped off 4.7 V-8 engine. Those two engines are cousins. But, the 3.5 motor in the Challenger has nothing in common with the HEMI 5.7 motor.