Hi
If you have a normal coil fitted as standard ie live feed in, -ve out, try removing the wire which goes to earth via distributor and use this as a 'make & break' connection by touching its mating terminal and removing. This should induce the coil to to off load its charge. Check this as I suggested in my last post.
This should elliminate (dodgy spelling?) the coil and put the focus on the distributor.