torque converters and gears do very different things
do you have anything done to the driveline? Rear gears? Torque converter?
The wide ratio gears probably wont help you too much, but sticking a 3.73 rear gear in the car, and maybe something like a 2600-2800 stall torque converter in the car will wake it up considerably. Just be sure to run a GOOD transmission cooler, and a GOOD shift kit, such as a Trans-Go.