I wouldn't bother with going to the electronic ignition. There is nothing wrong with the currect electrical system in a carrier. You just need to know how they work.
Make sure you have lots of grounds.
Go to Mac's Auto Antiques website.
http://www.macsautoparts.com/ They sell all sorts of Flathead ford bits. Tons of stuff that is usable for a carrier.
They sell an adaptor plate that fits on the top of the distributor to allow the use of a modern coil.
When I re-did the electrics in my UC only the most basic was ever done. I bought some #1 gauge welding cable wire for my battery cables.
From the positive on the battery I have a short cable to a ground. From the negative I go to the starter button (MK1) and then back to the starter motor. From the "hot" side of the starter button I have a smaller gauge wire go to a toggle switch. This then goes to the negative terminal on the coil. From the positve coil terminal it goes to the screw on the adaptor plate.
That is it and I have never had any problems.
For a Mk2 it will be slightly different due to having a starter handle.