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If you put a 2:1 gearbox between the 6.0 engine and transmission you will likely exceed the torque rating of the transmission. 2 x 380ftlb = 760 which is greater than 425 ftlb.
Torque at the crankshaft is unimportant, it's horsepower to the wheels that matters. If you change the gearing to work with the 6.0 it will outperform the 6602. Of you change the gearing to work with the 6.0 it will likely not work with your budget.