What shocks with cal-tracs

:sad1: I have the complete cal-trac set up on my 67 cuda coupe.the split mono leaf and the 10-way rancho's.The thing is i moved the leafs inboard for more tire clearance and now the rancho's are to long i think.Most of time the 60' are 1.46- 1.48 on a cool day.But today on a hot trac the car would not hook at all.Tire size 30x9 radial.What shock can i try to help this problem :salute: