Thom:
I agree with Jim, torsion bars (TB) first, shocks / strus next and then sways. Having said that, on my '76 I have only done the shocks / struts (Konis, set one off full soft) with sway(s) in the box to install. Most likely will not do TB because is a street car and I have to drive on the ##$% roads of NoVA and DC.
My car runs 19mm front and 23 mm rear. If I stumbled across a set of 21 mm front and 25 mm rears I might put them in. Assuming all things are aligned in the universe and the other vehicles don't need any repairs...
There are several members with SCs that would most likely be happy to let you go for a ride to "shop" before you dive in. Best advice is to ride in it before you make the swaps.
Jason