[Lynn Eades]

Andrew, If you still have the dizzy out, have it checked again. making sure the dwell is correct and timed correctly. (one set of points does each) I have heard that this dizzy is better than the later crab.
As far as load goes, dont be tempted to over gap your plugs. The bigger the gap, the higher the voltage required to fire them and as you know that spark is always looking for the easy way out.
I have read some but not all of the thread, but have your coil tested. It needs to be tested hot as it would be in use. That's when it will break down. (the standard 6 volt coils including NOS ones are guaranteed to fail) It is a hot enviroment inside those engine covers and everything needs to be clean and tight with good insulation.
Make sure your adapter has no signs of tracking or cracks.
Used points are good because the gaps don't change so quickly.
If there is any rust on the points springs then they easily break.
If you are going electronic, then pertronix do a unit that goes straight in.
I would suggest a Pertronix II.
They recommend resistor leads (should be fitted with all electronic igns)
There are leads available that have spiral wound stainless cores along with the carbon. I have gone this way but as yet cannot report on them.
You will need the correct coil to go with the system.
There is no condensor with used when you convert to electronic.
Good condensors are harder to find than they used to be.
Basically you have to go through it all to guarantee a good result.
Finding someone who is good with the distributors and has a timing jig and can run the dizzy up on a distributorgraph would be ideal.
Good luck with what ever you do.