For the early 350z I don't think the effect will be as good visually.
Reason, the actual chrome in the headlamp either side of the dipped beam is used and designed to enhance the light output of the lamp. The zenon set up leaks light by design either side of the dome glass. The facelift lamps with larger optical dome does away with the light leak as it's not needed.
Still can black parts of the upper inner headlamp but might look odd.
David