Voltage to coil

I am hoping this is a quick one for someone. I am having issues getting my car to start up. It is a '64 Barracuda with a 318 in it. I believe it is the factory coil that was on the motor when the previous owner put it in. When I check the voltage on the resistor on the firewall, I get 11.6 on the top and only 4.6 on the bottom. This means that I am only getting 4.6 to the + side of the coil. If I bypass the resistor and tie the two lines that go to the resistor together, she turns over on the slightest turn. I know I need more volts to the coil and have already bought a new resistor from the local Bumper to Bumper and got the same readings. Now I am at a loss!? Any ideas or suggestions?