I could be wrong, but i dont think there was ever a buick turbo 6 in a monte.......i know there was a turbo engine pu tinto a few 79 montes, but not the buick engine, or was it???
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=34204&item=2436129070
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=34204&item=2436129070