I have been watching this post with interest. I put a rack in my Demon a couple of winters ago. It was a long and drawn out process for me that involved lots of re-do's. As Mr. P said remove the torsion bars and the shock so that the lower control arm can move up and down freely. Mock up the rack and attach it to ball joints. Build your self a guage that you can put beside the tire to do some measuring off. Reinstall the tire and then jack up the tire through the entire travel and measure both the front and rear of the tire off the fixture to see what is happening with the toe as the tire moves up and down. The positioning of the rack will effect the toe issues as will the distance above or below the ball joint the heims are located.

I would also attempt to get the attachment point for the rack to ball joint as close to the tire as possible. This will get you some ackerman and help when the car backs up.

I built my own lower ball joints - I was not comfortable heating and bending or welding on the stock ones - Just me!

My front end works okay after all the work. I was never able to eliminate the bump steer issue but I did limit it to the very top and the very bottom of the travel. I limited the front suspension both ways to compensate for it.

I now have about 3 - 4 inches of front end travel. If I had it to do again I think I would have installed struts. Same travel no bump steer issues. That may still happen!

Good Luck and I hope you have a beer fridge in the garage - Mine involved lots of head scratching and the odd frosty beverage