3.55 or 3.73. You need to think about your future upgrades. If your going to run a blower 3.55 is the highest I would go!!! 3.73 is safe for just average bolt on power.
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2002 F150 SuperCrew
1990 5.0 LX Coupe
1989 Saleen Convertible #243
1965 Fastback - 331 Stroker/T-5 swap
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