Im not sure....but I think the 350 uses a smaller fan and the diameter of the hole in the shroud is smaller. Repro's are available but if you look around here in the For Sale section as well as Ebay, you should be able to score an original for less. The repro's are also rough on the inside as they are fiberglass instead of plastic.
No its taller. It would interfere with the engine components. However!!.... Here is one for sale http://www.v8buick.com/showthread.php?p=499104#post499104
Yes you can, you flip it over. lines up perfect. You will have to trim it back some and make new brackets to hold it, pretty simple. I will take some pics tonight if I get a chance. Jeff