Leave your timing light hooked up when you turn the key off.
If it continues to flash than your ignition switch is not doing it's job and you have your Boyer connected to an always hot lead. Needs to be powered by a switched lead.
If it does stop flashing you're dieseling, but I'm tempted to say that your Boyer may be hooked up wrong.
BTW, that plug looks great which reinforces my suspicion that the Boyer is hooked up wrong.