At a shop what am I going to probably pay to have a external turbonetics wastegate installed?

Viddy

PICS:   http://img.photobucket.com/albums/v728/CountMonteCarlo/Camaro/100_0987.jpg http://img.photobucket.com/albums/v728/CountMonteCarlo/Camaro/Camaro_Interior.jpg http://img.photobucket.com/albums/v728/CountMonteCarlo/Camaro/100_0115.jpg http://img.photobucket.com/albums/v728/CountMonteCarlo/Camaro/100_0978.jpg http://img.photobucket.com/albums/v728/CountMonteCarlo/Camaro/100_0975.jpg http://img.photobucket.com/albums/v728/CountMonteCarlo/Camaro/100_0926.jpg   The body is rough as hell

Looking for a good set of Half shafts for an 87 quest guys, I know someone has a good set laying around.   I was getting this wierd feeling when i was driving in my car like my Clutch was Slipping, Usually in 3rd 4th or 5th when i get on it. I put a brand new stage 2 clutch with a new flywheel in it. Didnt fix the problem. Lifted the car back up to see if I can see anything under the car. And I look at the Half Shafts. The Driverside seal is broken also its not laying flat aginst the rear