351 windsor. Truck runs and drives. Put a timing light on it, 10 degrees BTC as per the factory spec. When I rev the engine, the timing mark dosnt skip or jump at all. It just stays at the 10 degree mark. I'm pretty sure the wire harness and plug are the problem. Without trying to track down a used harness with plug, what are my options here? It's the tfi iv ignition, and nobody seems to have the harness. What aftermarket ignition do I go with for a replacement?