Reading...It's answering the spark condition.
What's this about premature wear on copper plugs? I know that 104's will have to be replaced more frequently. I'm also fairly certain they work totally fine in these cars. This link looks like it could be rather dated - http://www.aa1car.com/library/sparkplugs_for_dis.htm
This link was also helpful regarding the ignition system - http://www.greatautohelp.com/auto_ba...scription.html