A T-56 is the best bet,I have D&D built T56 in my 94 Z/28 and has taken alot of abuse with no problem,it has everything done to it.I have a stock viper T-56 in my 69 vette with no problems.
A T-56 is the inexpensive way to go,I know some guys who run 9's on stock T-56's.
A for the TKO 600 I had one and wasn't happy with it,sold it to a friend who had to have the thing rebuilt to work right,this was a brand unit.
The biggest key to lots of power throu a manual is the clutch.
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