When you lower a car with shorter springs the LCA angle changes but it changes to an unfavorable angle when you lower it a lot. That's where the drop spindle comes in, geometry is unchanged. Now, if you don't have a drop spindle, raising the lca inner mount and using a shorter spring achieves a similar thing, it moves the suspension up. It also achieves a better UCA angle on a corvette without messing with the spindle height. The only issue is, how do you do it, the cross shaft is tight against the crossmember so it's either notching them or fabricating a sleeve with threaded ends, weld that somewhere mid plane of the crossmember and use bolts to secure the a arm without a cross shaft, the bolts will go through the bushings. This is how many unibody cars have it and it. I don't see a stepped cross shaft working there.
