Old Mallory. Rock solid. If you got an MSD like control box, you can listen closely to the box when the distributor triggers it, or drag the white wire off a ground and you should hear a high pitched squeak out of the control box, that's the transistor triggering ~6 times and you can hear it. That would tell you if the control box is actually sending the coil the CD signals. Whats the resistance of the coil? I know it doesnt like race type coils with their extreme resistance values.