For street use I would not worry too much about flywheel choice, Either will hold up fine, Southbend is also now using a high quality Fidanza aluminum flywheel with the SS Street kits.
Noise is going to be there with ANY flywheel unless you get the "Quiet Disk" kit, This will knock it down to almost unnoticeable levels with any flywheel although you can here some noise but muted only under 2500rpms under load conditions, Not many people drive around in 1st-2nd gears at this RPM so its not really noticeable.
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