I don't know how much you want to spend, but if your looking for cheap check out the petronix ignitor II system. It replaces the points in the original distributor with a solid state ignitor and a 45,000v flame thrower coil. It installs in a few minuets and works great. I'm running this set up in my 65 and it works great and has been very reliable. It also allows you to keep your original distributor if that is important to you.
Definatly a popular modification. I've converted six diff vehicles to the stock DSII over the last couple years. For cheap, reliable and easy to find, it's hard to beat. If I were building a race vehicle I may go with a Mallory, but for a driver, still the DSII.
66 Coupe 200ci I6 Stock
66 Bronco half cab 203ci I6, CI aluminum Head and intake, Holley 390cfm 4V, Clifford header, Isky cam, KB pistons 9.7:1 comp, DSII ignition