Not sure if this will help much since the engine is not there. The larger wire connects the positive lead from the starter to the alternator completing the path back to the positive terminal on the battery. Routing the smaller starter solenoid wires is pretty much at your discretion but it should be close to the way I've shown it on the picture. The wiring harness for the starter an engine are not in the car at the moment but I did place it in there connecting up the connection behind the booster and laying it around the firewall with the rest of the wires. The bends in the harness matched up well.
