Chop the front a 2 - 3 inches, and move the back of the roof and glass up to match up with it. Then fill in the open space in the back for more of a business coupe long trunk look. I would leave just a hint of the back side window. No more than the wind wing in front. Then just to mess with the Nash guys, I'd move the wheel openings up about twice as high, while otherwise keeping the shape. That is all that comes to mind for the side view.
Second thought, after finding the rest of the shots.
The hood could use some pancake work. Double bar the grille. Lose the bumpers.
That should do it.