From what I can find that's a 3 ohm coil from a KZ of the same era. There's been some discussion lately about whether or not you should use a resistor when running 3 ohm coils on an sohc4, but plenty of people are using 3 ohm coils without resistors added. You might want to look for those threads and decide for yourself. Lower resistance coils do draw more current, but as long as your charging system is up to snuff it shouldn't be much of a problem.
