I would say either get 3.73s put in (I assume you have the .64 overdrive TKO) or run a T56 with your current gears.
I will be running the .64 TKO with my procharged small block with 3.70 rear gears.
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2004 NASA AIX Mustang LS2 #14
1964 Lincoln Continental
2014 4 tap Keezer
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