Well you could splice in new wires and there is a faq on that but I prefer new coils.
With points, to keep down on maintenance, stick with 5 ohm coils. They do not need to be oem though. Any dual wire 5 ohm will do fine.
If you have an electronic, check its ohm rating but you may be able to go with 3 ohm coils such as those on the later cb750 dohc or the cb900. Those have replaceable wires.