Those springs don't look too bad. Just clean them up and put them back.. All depends how far you want to go. Stripping them down to clean them. They will be getting past their use by date by now with rust and tiny stress cracks
and losing some set. Oiling them .I am guilty of doing that only to stop them rusting further. A leaf spring works on friction between the leaves. Rusty springs won't work properly. Greasy or oily springs will cause springs to flex more eg less friction and make them softer. ....

