I think I would daily it at this spring rate. I have solid mount race seats in it with little cushion, all suspension 'joints' are ball (no bushings at all), and it's still a fairly compliant ride.
FYI I'm now at Z62-152-012 672lb/in front and Z60-127-14 784lb/in rear SWIFT springs. I run a heavier engine that N52 and S54 up front with the huge turbo setup.
Springs just swap right in. They are slightly wider than 61mm but no issues using these for years.
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