This car got built because, well, we owned it. We had a decent chassis laying around, and Ron was already running a 260 so it made some sense.

That said, as noted above, the flattop carbs aren't that bad once you get them sorted, and the 260 makes a bit more power with a fatter torque curve than a 240z. Not quite as many revs though.

All in all, I think a to the hilt build on a 260z will be just as fast as a 240z. Plus, the chassis are just cheaper as they are not yet really sought after.

On the other hand, I think the 280zx -- 4 wheel discs and all - is the Z car to build from the ground up. Probably more so than the 280z, just due to the brakes.

All Z cars can be competitive, still, in ITS though.