Depending on how bad the spring is, I wouldn't compensate for it with a stiffer shock.
You could end up with a squirrely setup and lose control. Chances slim, but possible. My 67 had that problem and I had air shocks. Tried to take a curve a little faster than usual and lost it in the ditch.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.