Using an HEI module does not eliminate the need for a ballast resistor. It's the design of the coil that will determine if you need a ballast or not. If you purcahse a coil that does not require a ballast to limit current an prevent overheating you can use it with the mopar ECU too.
Both the coils listed in the above link require a ballast resistor when used with a basic electronic ignition module like the HEI or mopar ECU.