ballast resistor help needed

i recently did the mp electronic ignition conversion to a 318 in a 72 dart. got it all tuned and running nice, after idling for a couple of min. it died. now it wont start at all. coil isnt putting out any spark, so i swapped it for another i removed from a running car w/ elec ign. still nothing? so now i figure maybee ballast resistor? not sure what to ask for at parts store, as this ballast came with the ignition kit? anybody know what ballast i need?