[175K911]

If you have 23mm front torsion bars, you don't have stock. The stock bars were 18.8mm. But to answer your question if I understand it, yes, stay with the 23mm front torsion bars you currently have.

In the back, you can't install coilovers without strengthening the chassis. The engine and trans have to come out so you can weld strengthening plates in back, gusseting the tops of the shock towers, and weld in a roll cage with the rear legs attaching to the chassis in back right next to the shock towers. There are people who've gotten away with not doing the cage part but the new springs will cause chassis flex in the back. There's no way to do it right without at least welding in the reinforcements and gussets.