How much clearance do you have before hitting the bump stops on your lower arms?

I just lowered my car this weekend. I went from a 318 to a 360, not sure of the weight difference but the car sat to high in the front. I ended up dropping the car over 1.5" and probably have between 3/4 and 1" between the bump stop and frame. I more or less set my height to were I thought the car looked good and so the TTI headers would clear speed bumps or other things. I could probably drop it more but Im still running stock torsion bars so I'll play it safe there