It could be a number of things... Does it smoke white all the time? White smoke when its cold is normal. After its hot, it may haze just a little as it is a IDI engine and they are not as clean burning as the newer direct injected diesels. Retarded ignition timing will cause more smoke as well. It could be the turbo, check for shaft play. If you can see it move quite a bit, or it has end play, its toast. A good swap if you are just looking to stay stock would be a straight T-3. The stocker has a crappy waste gated exhaust housing design, and the compressor wheel is not a very efficient design compaired to newer T-3 turbos. Also change the oil if you are not sure what is in it. Oil thats too thin or diluted will blow past the rings and valve guides, and burn as white smoke.
As said above, drive for a little bit and check the coolant level to see if its going down.
Does it have power or is it sluggish? Check some of these things and let us know what you find.
Jason
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