A bumperless 280zx can look ok, you just need a non stock lip. It looks similar to an s30 with the MSA lip and no bumper.
Yes it does kill aero, , but even a bumper'd 280zx isn't exactly the most aero dynamic thing out there. I went from an arita speed G nose to a regualr front with an MSA lip and you could noticeably feel the difference/drag at highway speeds.
The wheels look ok, but the tires are undersized. Stock size is 195/70/14 which equals 24.7in in diameter Your tires are 23.9 inches in diamter so they are noticably smaller. It also doesn't help that it's a 2+2. That makes the wheels look small. Could use a small spacer and lower it more to fill the gap.