71 Scamp NASCAR style spoiler???

I think it could look good but the details need to be integrated with some small details. If I was doing it I would take it out to the edge of the quarter panel. Probably put a radius from the top edge down to the sharp line of the quarter.
I like the pic that has a little bit of taper to the top edge from the center.
I would think it’s even function and might make the car more stable at freeway speeds.