HI spences66six,
The distributor question usually ends with more opinions than you can use, but I will take the first stab.
The dizzy in the stock 66 with the autolite 1100 carb is a dual vaccum advance unit that is designed to work with the 1100. That is to say that there is a valve in the side of the carb where the vac line from the dizzy connects. This dizzy is referred to as the Load-O-Matic and was engineered to both advance and retard based upon the signal from the carb. Works fine as long as the carb and the dizzy are in good condition. In this regard I note that many of us Load-O-Matic owners with automatic transmissions have experienced ruffness at idle that can be very difficult to correct due to this relationship. Long story short, the Load-O-Matic will not work correctly with the common 2 bbl carbs everyone is using (Holley 5200, Weber 32/36, Weber 38/38, Holley 2300, etc.). Personally, I'm running a 5200. I think the progressive carbs (5200 & 32/36) are better at the bottom end (torque issue) and better for milage.
OK, the fix for the dizzy. You will need to switch to a dizzy with a mechanical advance system. There are two choices here. The stock 1968 to 1973 dual advance dizzy (has mechanical and vac advance), or the Duraspark (also mechanical and vac advance). If you go with the 1968 to 1973 dizzy and want to stay with the Pertronix unit, you may not be able to use the Pertronix unit in your current dizzy. The usual Load-O-Matic has a rotor drive that looks like a "D" from the top. The dual advance looks like a "C". So, unless you have a dual advance in your car (this is possible - some 65 / 67 cars were delivered that way), you will need a new Pertronix unit.
I use the 68 dizzy with the Pertronix II and the Flamethrower2. I am very happy with it. I also eliminated the vac advance in order to better control my advance curve. This is an easy conversion, but will reduce mileage to some extent. PM me if you have interest in this item.
Good luck with your project. You can see my set-up here
http://kastang.tripod.com/fsp/parkinglot.html
