Need info on degree angle of block for trans mod.

I plan on hollowing out the u shape in the torsion bar crossmember then strapping it with doubled up steel sheet with both pieces the same thickness as the crossmember. 14 gage I believe it is. Then the crossmember will be welded to the new floor pan when I put that in. Will probably be plenty strong. I plan on moving the inboard mounting holes out about 2"