Coilover question!

[samples45]

Hey guys, I'm a bit confused on coilovers, never worked with them before. I got some QA1 for front and back. I called qa1 and asked them the ride height for the shocks I have and made my mounts for the specs they game me. As the truck sits right now it needs to come down about a inch and half to two inches. How much do y'all think it would come down when everything is on the truck? I can't adjust my spring any lower and they are 12 inch 450 pound springs. Anyone running front coilovers wanna chime in or just anyone that knows coilovers cause I sure don't!