If your keeping the car mostly on the street and will be adding the KB, then stick with the 3.55's. It will be plenty of gear to get you going. Remember that you'll have a ton of torque down low, so breaking the tires free will be very easy to do.
I've got 3.55's on my N/A 331. Right now, they are not the ideal setup, but with a ProCharger in the future, it will be just fine.
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