I've got a 67 289 that has been working great until last week when it just stopped going down the road. It had done about 3 times before but always re-started. This time I could not get the engine re-started. The engine will fire when ask to start but when I let go of the key it dies right away. No sputtering like it's not getting gas , so I've ruled out a gas problem. I'm tthinking it's a ignition problem. Does anyone know where I should start lokking???