Al, I've found that same info in several places, but here's what the updates in the tech section of legendscar.com had to say about it:
"8/13/01 Shock Mounting - Mounting rear shocks upside down will not alter the performance of the shock. It will, however, allow you to make changes to your car's setup without having to crawl under the car. You will simply jack the car up in the rear, and make your adjustment. Remember to tape your shocks or use the above mentioned clamp to hold the coilover in place after any update so the setup does not change."
Ours were already upside down when we bought the car, but I'll go back through some of my files and see if I can get you more input about this subject.