Wow . . . just read that article.
Spark Plugs: $146.00
Water Pump: $375.00
????????????????
Same job done yourself on a 1980's blackmax = under $40 in parts and less than 1 hour of your time.
NGK BU8H plugs cost $2.25 each (5 minutes of labor)
Water Pump is $25.98 with the housing delivered ( 45 minutes going slow )
http://www.ebay.com/itm/Water-Pump-I...-/300996123884