The turbos are ok AS long as you treat them right-I.E. If you boost them you need to let them cool down [idle] before you shut it off- cool down,the heat kills them, a intercooler helps alot but on the gl"s its a pain to put one on so if its stock you just treat them with care and they"ll be okay you can flog em!!
What is the longevity of the Turbos on those?
I don't know much about that part of them.
I've always be pretty leery of Turbos.
I had a 85 gl-10 T I built that pushed 12#s of boost and still got 32mpg-that thing was a blast but it liked cv"s & tires, It was sleeper car plain jane [I took all the stickers off-white w/blu.int. BliZZaks didn"t last long on pavement but stuck good after they were bald:headbang::grin: Chevelles didnt stand a chance!!