Assuming that they still have a choice of lower hinge pin holes in the rear hubs you can adjust the roll centre that way.
Roll centre on the front can be adjusted by spacing the outer upper ball joint up or down.
The only thing that needs some thought with applying set-up changes to a Pred is the lever arm effect of the bell cranks / rear shock mounting blocks. Once you get your head around it then it's the same as any other car .... more lever ratio = softer ... less = stiffer
To be fair for the many years I ran Preds all I felt the need to change to dial the car into various tracks was the rear roll centre, front oil & spring and rear spring. It was one of the most simple cars to set-up I have ever driven!
Good luck with it.
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