To me it really depends on the power. If you have a lot, most guys limit the downward travel to keep the front end down. real "springy" torsion bars for for lower powered applications were the car needs help getting the weight transfer on the back tire. Another issue is a lot of street use and potential oil pan damage. Looks like you have a big block in a B body, this usually works good. I would stay with the 0.960 IMO.