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Yea, it should help a bit. I had a '95 TA w/ 2.73's and the dead spot was bad but my '98 WS6 has 3.42's and it's not as bad. I'd probably even step on up to 3.73's, if your going for a gear change.
The dead spot is caused by the stock(POS) torque converter. It will still be there when you change the gears, but it will get you out of the dead spot quicker.