Depends on how wore out your torsion bars are but usually 2" tops is what you get on the stock keys with the bolts buried up.
Lifts come with leveling keys so they'll be higher off the bat with no bolts.
Not true with all lifts. Some companies market a 6" lift or could be 7 , 9 or whatever. But they set the lift up with brackets that are 2" less then the stated lift hieght then leveling keys are used to gain the stated hieght.
But some companies market their lift to that the height if the brackets are. So by I stalling it and setting your stock keys to the same position the body's were will net you the stated lift height.
The zone lift on my lml is stated to be 5". The lower control arm drop brackets are exactly 5" on bolt centers to where they bolt to the team and where the a arm bolts in. No I run my stock keys turned down about 3/8" lower than stock was. My tv's are almost level and truck rides better than it did stock..