that scoop is what really drives home the "period correct" feel. it has the whole: i'm not here to make friends, i'm here to make money on a saturday night. it's what makes that car the long haired boyfriend with the leather jacket and motorcycle you really don't want your daughter to date.
that being said, flat black would look the part. but i'd totally rattle bomb it and not have it professionally done just to keep the overall aesthetic of the car looking the same.