1: No. Your coil momentarily sees 12v during starting, then sees 9v during running, as intended, in an attempt to preserve the points.
2: Yes, but do fit the right type
3: Yes, but... The resistor is there to prevent the points from burning out during operation. If you no longer run points, then the ignition system will have coil recommendations, and you can bypass the resistors. (fwiw, my distributor does not contain points, so I bypassed my resistors, and run the hotter "red coil" as recommended by the ignition/distributor manufacturer*)

The 113s have essentially the same systems, and their owners have a great resource that should spark some ideas...

See the diagrams on these pages for explanation of what the resistor/s do:
Pagoda SL Group Technical Manual :: Electrical / TransistorIgnition

Pagoda SL Group Technical Manual :: Electrical / IgnitionSystem

Coil info: Pagoda SL Group Technical Manual :: Electrical / IgnitionCoil

*side note; Look in to ignitions from Pertronix, Crane or that which my car uses: "a modern Dutch distributor that controls advance, whose name invites inevitable sniping about cost, but supposedly is as easy to install as 1-2-3!"