converting to electronic ignition

Thanks for the diagrams, these are a little easier to read than the ones in the service manual, but the engine bay harness doesn't match up to it. For example, on the engine bay side, this shows 22 wires on the bulkhead connectors, but mine only has 20 wires on the bulkhead connectors, and some of the wires shown here on the connectors don't exist on mine, but some of mine aren't shown on the diagram. I think my engine bay harness is out of a 76 just based on what I see on the number of wires on the connectors, but I haven't traced the wires down to see if they match.