Lowering problems?

Sounds like you didn't have the lower control arms all the way down before you installed the torsion bars and then applied weight to the car. That's why it is so spongy and hitting the bump stops. Whether you changed the ride height before or after the alignment doesn't really matter because the car shouldn't be hitting the bump stops unless the car has been adjusted ridiculous low in the front end.

I would first think of how the torsion bars was installed and if they are in correctly. Just a little turn of the torsion bar makes a difference. Second I would set the car to stock ride height and make sure the car isn't riding on the bump stops. When I was learning about mopars years ago I rebuilt the front end of a 68 Charger. I let the front end down and the front end was very close to the concrete and on the bump stops. I had to remove the torsion bars make sure the adjusting bolt on the lower control was all the way out and the LCA was all the way down. That fixed it.