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I am into agressive street driving and would mind doing some other events that include some nice twist and turns.

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I have 1" in the 66 Coronet and find the spring rate perfect for aggressive driving with the heavy 440 up front. They probably would feel stiffer in your car because of the lighter weight of the small block. I would start with the .960 and invest in a set of Hotchkiss sway bars. You could always swap in the bigger bars later.