Depending on what your application for the engine would be you could always use the points under the flywheel to control an automotive style coil and run it off a 12v battery, forgetting the damaged mount posts altogether. It would be a good proposition if you were making a small 12v generator project, we have run a alternator mounted on the front of a 3.5hp briggs (on an old edger frame) on our caravan batteries in the bush for a good 18 months now.
