that engine works well. just make sure you have a good setup and youll be fine.
For the body Wind resistance is a good thing as it provides the downforce you need to keep the car from becoming a plane. The slope of the body lines determines where and how much down force you can get. The rear wing provides the rear downforce while the slope of the grill section and hood along with the window plays a role in front end downforce.
try a dodge stratus aero 2 body, most pro use that one