The GM kit slams camber out to max negative not adjustible. You will get something like -3.0 front, -1.5 rear if you put them everywhere you can.
As a note, I don't know if that is just one. You may need six sets. Two for each front, one for each rear. Ouch. Or you could just get two and use them on the front lower a-arm front bolt and get more camber and use the stock ones for the front lower a-arm rear bolts to adjust caster.
In my opinion, the Harbar setup is better. You can call them essentially order whatever you want.
