Not Ranked
Joey, the C6 is probalby what was in the TBird you pulled the motor out of. The lesser transmission was the C4. The C6 was always put behind the big blocks. If fact, Shelby put the C6 behind the twin turbo Cobra that sold at BJ last year. Cast Iron and can handle anything you throw at it. Depending on your 390 build, say 450 safe HP, a stock C6 or a slighty uprated C4 will take all the torque you give it with your motor.
Mark
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