Torsion bar crossmember install

Mtreblig said
So, when you fit up the new crossmember, I assume to insert the torsion bars into the new crossmember (with spring clips inserted) and then weld the new crossmember into place? I think would also dry-fit my new floor pan in to see if I'm ok in the up-down direction (crossmember height).

Yes exactly, make sure you clamp or screw the crossmember tightly in place, then make sure the torsion bars move in & out freely without any binding, then weld in place, I did not pre-fit the floor pan, no need too because there is a lot of space for the new crossmember.