No need to clamp the bars. Loosen the pivot shaft that bolts through the k-member and remove the nut on the front. Use a pry bar between the lower control arm and K -member with spacers of wood or whatever you have. Then just pry forcing the torsion bar/lower control arm backwards as an assembly. If you haven't done so, spray some penetrating oil where the hex of the torsion bar fits in the cross member.
Ron