The adjustable bilstein 5100s are fror coil spring front end rigs (I have em on my jeep). Your denali has torsion bars. This will not work to lift the front of the vehicle.
Bilstein does make front and rear shocks that you can make fit on your denali, though you will have to look for z71 shocks if you want to lift it. The denali comes stock with electric front shocks and air rear shocks (this is why no manafacturer states that their standard shocks will "fit" on the denali, they'll still bolt up just gotta turn off the air ride, this I have done) which will need to be deleted.
You will need keys or just crank the stock ones to lift the front.
You can use the z71 springs in the rear. Are you still running the rear air shocks?