Improving 60ft time?

Do you have the clamps on the front segment or the rear of the leaf springs?? they should be on the front and remove the rear ones..try a pair of drag shocks set at 50/50..my '70 duster street car ie: full exhaust,interior all steel except hood running a "stock stroke" 360 with a 3800 stall converter runs 11.80's best of 11.79...