That and more is dealt with in this Wikipedia entry that mentions the styling was by Giugiaro.
Eagle Premier styling is not distinctive, being one of many clean, "three box" efforts by the Italian master in the 1970s and 80s that look pretty much the same at first glance. Perhaps the main difference from other ItalDesign creations was that it was larger due to its being for the American market.
These Renaults furnished mechanical and other parts for the Eagle, but not complete bodies.
A brochure spread when it was a Chrysler product.
A glimpse of the rear styling.
The Eagle Premier in Dodge clothing; note the badge-engineered grille. "Monaco" was a model name long-used by Dodge and probably slapped on the car to legitimize it as a Dodge.