I'm in the process of gutting a 280zx now, I'm amazed at how much room is behind the dash. If you want a track car, the weight savings would be tremendous especially if I went with a custom aluminum dash.
I was happy to realize how simple everything is behind the dash. It is very easy to work on. To me much easier then my 73. It has been of great value doing this because I need to swap my Auto climate A/C to the standard a/c system. There is not much to the standard A/C.
Good luck. The Dash itself comes out very easily.