I have had mancini rear springs on my car for the past 6 months. No problems with them and they gave my car a nice stance again. I would also recommend you get new shackles and both sets of leaf spring brackets.
im assuming your profile pic is your car. if so it looks realy good, and would be the stance im looking for. i read somewhere on here that the mancini springs might be taller on the passengers side. could you clear that up for me? its something i want to avoid because ill be driving to school every day, about 40 miles there and back.