dart hei killing battery

How do you know it's hei? If the HEI is drawing power, it should not shut down the engine

More about how it's wired?

How about an alternator? You run one? You sure it's charging?

And how do you know anything for sure based on what you have posted?

Under "what conditions" does it kill the battery?

Sitting parked? have you checked for parasitic drain? You do that by first putting a test light in series from ground to the disconnected battery NEG post. Look for a light

Charging? What is the running voltage?