It was lowered close to 2" but probably not the full 2". I wish I had a better answer, but at the time I was running the drop spindles I was very much still learning about Mopar suspension and I never took a proper "A-B" measurement to compare to the factory ride height, I was just measuring the distances from the ground to the fender and the header flanges because that's really all I was worried about.
As you know if you run 2" drop spindles without the full 2" lowering of the car you're actually making the control arm angles worse than stock, the equivalent of raising the car with stock spindles. So roll center, toe change, camber curves, etc all get worse.
When I did the comparison though it was between my car with the 2" drop spindles and another E-body that was lowered so the A-B value was 0, which results in the better suspension geometry than at the factory ride height. So even if I was lowered a full 2" the car lowered with stock spindles would have had better geometry because of the improved control arm angles. Compared to that car, the roll center on my car was substantially higher, and the toe change through the same travel was worse. The bump steer in the car wasn't obvious under normal conditions, and even pushing the car in the corners I wouldn't say it was terrible. But there was a little instability that was noticeable, especially on rougher roads.