You tread them gently
Are they completely destroyed? Can you at least lead the stud straight in?
There are nuts that you screw in on BOTH ends. So there will be a nut on the turbo side holding the stud in place and preventing it from sliding out, and there will be a nut on the TMIC side holding it down.
In other words the threads on the turbo are completely irrelevant at this point but it is preferable that they are at least partially intact to give you guidance and get the stud in straight. It won't be the threads holding the stud in, but the nuts on the stud's ends. The turbo one will stay on there forever and you just have to undo the top nut to get the TMIC off. You do not have to slide the studs out, the TMIC will clear them just fine. Make sense?