If you look at proper (not amatuer) race cars from back in the day they usually sat high in the front. On a drag car you want to start with the front end up some to help with your weight transfer. When aligning a drag car you generally set the suspension at "track" height. Generally other than to clear improperly sized tires the only reason to jack the back up is because someone thinks it looks cool. Ultra strong rear leaf springs have been known to raise the rear, but you don't have to have the back end up to have that amount of rear spring. I always refer to the high rear stance as the "Stink bug" stance.
I would like to see some documents that state that aerodynamics are improved by raising the rear. The best improvement for aero is lowering the car and installing air dams or underbody shields.