Un-stripped phone wires are way too big for 1/25-24 ignition wires. They can be used for fuel, oil hard lines, and ignition wires in larger scales. Sometimes the insulation can be used for boots slipped over properly sized ignition wires.
If you want wire that can be properly draped, try lead wire from a fly fishing store, or Cabellas. It only comes in grey, but can be painted.