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They are even on "effective rate" you are talking "spring rate". You say you want to run 250 springs f&r without torsion bars, that will give you an effective rate of approximately 230 front and 163 rear and a very unbalanced car.
On the Cup suspension that coilover was just a helper spring at a rate of about 100# that increased the effective rate of the rear suspension by about 65#.
Search for "spring rate v. effective rate" and you will get all the info you need.
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