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Why don't you push the motor a little and get into the power band around 6500 to 7500 rpm? I have 35k miles on mine with 7500 rpm every time it goes down the street. Still running strong. The engines are tough and can handle it if you do proper services.
If I was doing it I would run a E85 Stg 2 tune Header and exhaust push it with 4.88 gears or 4.56 and zing the motor 7500 rpm.
Going close ratio trans gearing would not help near as much as adding power and would cost you at least twice as much.
Good luck, keep me posted on your results..
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