91 CB Lancer suspension upgrade options

Hi guys,
I have a 92 Cb GSR.
Its got kings springs and KYB shocks.
Im interested in getting some advice on suspension upgrades.
Are there coilers or heavier springs and shocks that would suit the car?
I spoke to a suspension guy, and he told me that the car is too old for coilers.
Also, any suggestions os whether sway bars would help?
Front of back ? Ive been too the Whiteline sway bar for the rear is the way to go.
Any advice welcome!!!
Cheers Rob