Lowering height/Camber adjustment

[J-440]

Is there a formula regarding the lowering of coil over shock height vs the rod end thread count to the upper
a-arms? I do realize there are a ton of factors with different brands of shocks and a-arms but is there a ballpark figure? Or should I bite the bullet and splurge on one of those $1500 electric scissor jacks that lifts the whole car? I will gladly give out my wife's email address to other pro-touring wives to convince her that this would be a swell idea!!