I would be finding out what "platform" it shares with any other GM car --- that might be aftermarket items for. Since it was never a "performance" platform based on that particular car/model.... but perhaps that years Chevelle big block shared some chassis components with it (just using that as an example).
Also -- just some simple measurements of the spring currently in the car -- diameter and length... you should be able to find the spring RATE --- and then ask manufacturers what they have in that dia and length but in a performance spring.
That -- or just go to coil overs.... which is what I'd do.
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