I installed the "Pertronix Ignitor" (1st generation) and Flamethrower coil into my 1965 I-6 convertible around a year and a half ago. It was an extremely easy and straight forward installation and I have had absolutely no trouble since. I think that the total cost of the conversion was around $150, but I haven't gone back to check my receipts. You probably have other options, but for quick, easy and reliable, I'd recommend this route. Here's the link to the Pertronix site:
Ignitor
Hope this helps, good luck!