I went with the 550 lb springs after a discussion with UMI technical, based on the 455 block. Its stiff but not too stiff, and the handling and cornering are awesome now. Maybe the 450 would soften things up, but based on what I experienced maybe the lighter springs would have created issues simply due to the fact the car is lowered and there is less room for movement. I had to spend some time tweaking both the compression and rebound adjustments to dial it in, remove bottoming and not go too stiff. I'm no pro on this stuff but it works for me.
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