I'm pretty happy with my 3.70's, but I'm running a T56, so it's a bit different than the TKO600.
Since your BBC is going to make in the neighborhood of 600ft-lbs of torque, I'd lean towards gears in the 3.70 to 3.90 range with the size tires that you think you're going to run. I think that would be a great street setup.
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