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superchargers are belt/pulley driven....you scarifice torque because you have to drive the supercharger from the engine whereas a turbo setup uses exhaust pressure.
The SC's boost increases with rpm . So when we are at 4500 rpm , your boost is only 1 to 3 psi and a TT car has full boost at 4500rpm . So you will not see the same trq increase as you do hp , over a stock car
what someone else posted in correct, the centrifugal superchargers do not make enough boost low enough in the RPM for the bad *** peak torque numbers that the TT's make... but that doesnt mean they cant haul ***!
Still, that number is a bit on the low side...I would have thought it be closer to 330...did you have your setup tuned on the dyno?/ What's your A/F like??