When was electronic ignition introduced?

Can't get to the 340 as it hasn't moved in 26 years but unfortunately the intake and dist. are removed. I don't even remember removing them. They might be somewhere? The charger build date is 3-71. You guys have to remember I lived and worked in Chrysler land and (maybe?) some stuff were put on the road for testing, customers beware. I'll work on getting to the 340 but not today. lol pic following.