The fan shroud is for the radiator. Usually you can see the top part from the picture you supplied, but yours is missing, so I am guessing the whole piece is gone.
I forgot one other thing that might cause no boost and has been mentioned on the forum before and that is a plugged up catylitic converter or muffler. The car will usually run, but with no power at all. Check that out and let us know.
Russ
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