I went from my old non adjustable 450lbs to 550 Jr I single and my car handles amazing with that setup. I’m still running the 250lb rear spring. My buddy has a set of non adjustable a laying around that he might sell you for the same subframe and Quadra link. If you want a great ride and handle well just go with the single adjustable 550 and 250 springs. If you want to race it more go with a slightly stiff spring and adjustable with remote canister. Call jri and dse. They are helpful.
Also where are you located?
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