Western chassis 4" drop springs

[Louis63]

I already have 2 " drop spindles w3" drop stings. I want it a lil lower, how bad will alignment b if I swap the 3" springs for the 4" springs? I have a 7" flip in the rear, I was thinking of using shackles to level it out if I drop the front another inch.94 gmc reg cab sb 1500