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Just for perspective, I have a 20 year old Peugeot 306... It's on its original dampers and springs. They are still perfect even after 265,000 kilometres. But they are Peugeot OEM, possibly the best made up until the 06 era. What does definitely make a difference is all the rubber bushings for control arms etc. Really restores the steering accuracy.
Also think about these older cars. They are designed with longer travel and supple suspension. That's why they are fun to drive and comfortable. So get dampers designed for that, rather than a stiff lowered setup.
Tender Loving Care dude