Yes the longer front segment moves the IC forward and takes some of the "violence" out of the intial hit. Im not 100% sure about now, but i know Jason Digby was running the A body front segment springs for a long time, and deep into the 4sec range. IT can be done with the shorter segment but will just take a serious shock that has the valving to control that short IC hit. Shorter IC makes it seperate faster so good shock can slow it down/control it. IF starting from scratch get the longer segment, but make sure you get good rear shocks, they are almost more important than the spring