You can send Manny a PM (Nasty98) and he should be able to ballpark it for you. Hopefully some of the local guys can chime in for you and get you in the right direction.
We may need a couple answers however,
What year is your Vette?
Manual or Automatic?
Were you told you need a new torque tube or does your car just have symptoms where you believe the bushings are gone?
Glad to have you on the forum! Keep pestering until you get your answer.