[pcmcobra]

the drop spindle "should" keep the same geometry as stock. If you look at a stock spindle and a drop spindle side by side, you will see where the "drop" comes into play.
As far as the arms being level, lowering springs will effect the arms being level. The springs don't compensate for the changed geometry between the upper and lowers.
Hope this is not too confusing, wish I had some pics to explain a little better.