2” is about as big of a block as I’ve used and been comfortable with on just about anything. More than that and axle wrap starts to be a problem. Alter the mounting point for the springs if you have to.
I will have to look at the spring mounts, I don't think I can do much at this point to alter it so much. I know I have used 4" lift blocks on 4x4 without too much issues. Should be the same?