Without rear torsion.

[Panelfantastic]

I would call the torque bar a must . You definately need to strenghten that upper shock tower since it will carry all the weight of the vehicle and I'm sure your plans call for horsepower too!!! Triangulation of this area solves both problems.
My setup uses all custom parts so an off the shelf sway won't fit. I'm gonna hold off till it's all together and fab up a custom unit.