New distributor/elelctronic ignition/coil

In that case, if this "resistor cable" is working as a ballast resistor, then it should not have 12V at the coil +, right? But it does...

I think whoever built the car must have used whatever cable they had available back then, maybe the car never had a ballast resistor.

This is a pre-production car, so it could have been built before things were setup properly in the plant.