Don't worry Fett, I've yet to meet anyone who really understands coils, or at least can explain to the average joe what is important and what is not (including me).
However, a couple of points. The 16C6 coil was the standard coil fitted to a 'points' RRC and it is a 6V coil. When we talk about a 6 or 9 or 12volt coil we are not talking about the output, we are talking about the input voltage. So, because you have the original loom, the ignition source of 12volts travels along the White/Pink wire and by the time it reaches the coil, it has been knocked down to 6volts. This is because the white/pink wire is effectively a ballast resistor. If you are thinking of buyng a 12V coil, make sure it has an internal resistance of at least 3ohms, however, I have got the correct Luminition coil for a Magnatronic (as opposed to Optronic) if you want to try that.