Stiff suspension can be tricky. If you have height adjust on the suspension/coilovers. Try getting it raised as high as you can both front and back and if you have rebound adjustment on the front go as soft as you can. I have the AST4150s suspension kit, basically a circuit setup. Raising height to max , helped alot for traction in my case.
I think the 3.08 diff might be quite good once the power is in.
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