Dumbfounded. 340 will not start.

You must use the brown wire (IGN2) also. It is the only one that has 12 V ignition while cranking the starter (key in "start" position). Jumper it to the blue wire (IGN1). You can use a short jumper cable w/ dual male spades or there is a single male-male spade to clip them together neatly. I made that mistake when I got rid of the ballast in my Dart. No matter how long I cranked, no fire, but as I released the starter it sometimes started.

How did you verify a spark? I doubt you saw anything while cranking with the brown wire open. If not totally out of funds, buy a $4 in-line spark tester (Harbor Freight). Just because it sparks in the air doesn't mean it sparks at cylinder pressure.