Sorry I don't have a clue on the weight difference. I would say invest a few bucks and scale the car, you'll have a much better idea of where you need to be. If the car isn't together yet and you can't weigh it, I would guess going with the 350# springs. If you aren't in a hurry I plan on swapping springs here in a few weeks, and I can send you these 450's to try out. The cool thing is they've been driven hard and have settled.
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