It's bin a while but I'm still on it.
After setting the stance I found out that the front shocks where too short. the new shocks are gas filled and a bit longer.
I want the camber on the frontwheels somewhere between 0 and -1deg. but the adjustment did not go further as -2deg. now I will modify the Porsche A-arms. I will narrow them a bit and replace the original balljoint with an adjustable uniball.