I'd say just replace the solenoid, but, if it really is that old, go ahead and replace the whole starter. It is very easy unless you have headers. Remove the gound cable of the battery. Remove the wires, but note which wires go where, you have a big nut and a small nut. Then it is just two bolts that come out...she's pretty heavy though for a small part. Turn your core in and get anutter.
