I recently put in a petronix ignition conversion kit and coil. My 396 ran great for a couple of months. Then, depression set in. At first it would try to start while the starter was turning the die when the key relaxed to on. Now its not even trying to start. Got fuel. Got battery juice. Wires all connected. Timing was OK recently and the distributor is still on the mark. Caps on tight. Help!!