I question the 500hp built 350... But if you want a 5 speed then a TKO is the way to go, want a 6 speed, Go T56 or TKO...
T5's snap behind 200hp 305's... and there "rated" at 300 ft/lbs not HP
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2005 Joe Gibbs Silverado # 0396
1988 Monte Carlo SS 5.3/T56 and too many mods.
2003 Honda 954RR