What is bad shape? Wheels can often be "restored" and powder coated.
If you like the GTA wheels, install them (assuming they will fit correctly). Changing out the wheels isn't like a color change, custom interior, or radical suspension/engine mods. You can always and easily return to stock wheels.
I had IROC wheels on my '80 Z28. I loved them. I even think they complimented the car much better than the stock wheels or Cragar's of the period.
...this is *your* car, do what *you* want. You do not need anyones approval but your own.
Just keep the factory wheels around in case you decide to return to them.