rear leaf spring recommendations..??????

I wouldn't raise the rear just to fit some tire. How much are we talking about? How much faster can the car be compared to a 255/60-15 on an 8" rim? If you already have them, I guess this isn't very helpful. As for the stance, that is compensated by with a torsion bar adjustment. Just get a left and right, not 2 lefts, if traction is your concern, that is. When installed, raising the front left will lower the rear right, and force that tire against the ground more than the left, compensating for the right lifting from the engine's torque and spinning that tire.