Hi 66 fastback,
Sounds like you are thinking of keeping your options open. I agree that this is the way to go. First, you can use any carb you can figure a way to bolt on with the dual advance dizzy. So, lets start there.
The least expensive option is to install a 1968 - 1973 dual advance dizzy. You can purchase a fully rebuilt unit from your local parts store for about $70 complete with cap, rotor, and points. Order it with a 10* advance weight stop. Be sure it is the dual advance unit (vac and mechanical advance). This is a plug it in, gap the points, set the timing and go deal. It will even work with your 1100 if you remove the spark control valve on the carb (were the vac line is hooked up now) and hook the new vac line to the same port (may need a new fitting to screw into the carb).
The next step up would be to go electronic. Here you have two choices going in. You can upgrade the dual vac dizzy via Pertronix, or install a Ford DuraSpark (DS).
The Pertronix Ignitor II and FlameThrower 2 coil convert the points system in the dual vac dizzy to full electronic. You will end up with a 12 volt coil (good upgrade) and a 45000 volt ignition in a package that can be installed in about 20 minutes. As simple as changing points. This was my choice. Cost for Pertronix system is $105, complete. Add the cost of the dizzy and you are all in for about $175. Nice thing about this one is that you don't have to go all the way at one time. The dizzy will give you all the carb options you need (you can even convert to mechanical only if needed), and the Pertronix upgrade can come later.
The DS is a Ford electronic dizzy introduced in 1974. The DSII, the more desired system, was introduced in 1978. If you go with the DSII you can purchase the entire system at you local parts store for approx $175 with new coil. If you go this way, you won't need the dual advance dizzy discussed above. The DSII is a fully self contained electronic ignition system. Dizzy, controlller, etc. Installation of the dizzy is a simple drop in. Rewiring the ignition system to run the Ford controller will take some time. I understand the install is 2-3 hours if you know your way around the electrical system.
Which one is better. That discusion could go all night and there still wouldn't be a clear winner. Personally, I like the Pertronix.
Carbs. The Clifford adapter that fits the 1.5" intake will accept the Holley 5200 - 26/27 (270cfm progressive carb), the Weber 32/36 (320cfm progressive), or the Weber 38/38 (370cfm syncroness). I like the progressives. Good bottom end torque and mileage with all the flow you can use when you put your foot down. The nice thing about the Holley / Weber series is that you can upgrade to the next unit as you continue to upgrade the perfomance potential of the car without changing the adapter, linkage, or air cleaner as you go. Unless you change to the 1.75" carb bore head, and then you would need the correct adapter. As I said earlier, a Holley 5200 can be acquired from Stovebolt for $65, fully rebuilt. Linkage and air cleaner are the only "build it yourself" items, and these are very simple to develop. I can send pictures and instructions if you go this way.
Long winded. Hope it helps. Have fun with this.
