With resistance readings like 12k ohms, you don't really have "wires" at all. You have carbon with some kind of fiber string to hold it together. These resistance wires are designed to prevent radio static. The resistance keeps the spark from generating as many RF harmonics. There are no metal wires that would have that kind of resistance. If you put real wires on it you may get radio noise. If you replace good carbon wires with metal wires or new carbon wires, you will get nothing for your effort other than a chance to screw something up.
If you are having no noticeable problem with your engine, changing your wires isn't going to get you anything. Every time you remove the wires from the plugs or pull them out at the other end, you are taking a chance that they will be damaged. This possibility is much more real than the possibility of improved performance by changing wires on a relatively stock engine that is showing no signs of ignition problems.
If it ain't broke don't fix it.
