I'm going to set the timing on a TBI 350 and I know that the EST signal connector near the master brake cylinder needs to be unplugged first and the timing set to 0*. Can someone photograph the proper connector and tell me where the two wire ends (opposite the connectors) go? There is one connector that has wires going into the firewall bundle(to the ECM?) and there is a gray connector with a single green wire. Which is the correct one? Thx.