HEI Install Problems

I use the stock mopar coil just fine, no ballast. If you powered it up AT ALL without the module mounted flat to a heat sink you likely destroyed the module. Was the distributor you are using running on another ignition before this?

If you have ANYTHING else connected to coil NEG remove it. Might be shorting tach wire or bad radio cap, etc

Also some modern coils are tricky to hook up. Some have 4 terminals and are not wired as you might think