Dave
You should check, but I believe one way to get more adjustment is to use the track rods off a 280 which are a bit longer (1/2 inch or so)
The problem is that they are both rh thread, whereas the 240/260 is rh and lh thread.
What you have to do is get a spare steering rack and swap the rh thread rack end fitting into your rack on the car. With 2 rh thread ends you can then use the 280 track rods on your rack and get some more adjustment.