This site is dealing with racing Bilsteins, but the general concept applies. Shocks will NOT lower the car. If anything it will sit very slightly higher (positive gas pressure extends shaft) but will "bed in" with time. http://www.bilstein.com/motorsports/oval.html
. See the section on "Answering the Racer's Questions".
The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)