Lee, i will exhange my 1971 Duster for your Boss. lol
Seriously, that Dart is not Worth more than 15 000$. Was a bench seat car. lots of thing wrong on it. Paint job are expensive but you aready know that. .
A body 1972 340 got electronic ignition, 1973 all. Not available before 1972.
It seems all 1972 V8 got electronic ignition in the fall of 1971.
http://www.hamtramck-historical.com/images/dealerships/1972PlymouthOrderingInfo/1972%20p%20pib%2010.jpg