The Viking shocks have a lot of range, I have used them with .89 to 1.14 torsion bars and they have more than enough rebound dampening. You can literally make the suspension stock soft all the way to so stiff you couldn't drive the car with the available factory settings.
Now if you want to change the valve shim stack any motorcycle or snowmobile shop that does suspension work would have no problem with the fox shocks, and it shouldn't take to long to for them to redo any of the brands you listed.