gm hei no spark?

Of course. The pickup unit is what triggers the module to "make spark." You have "any other" magnetic distributor you can "alligator clip" in to test?

Does that Pro Comp thing have a pickup coil adjustment similar to the Mopars?

Also you said 'was working with Mopar 4 pin but weak spark'

The pickup WILL NOT cause a weak spark, but it could trigger intermittently, causing a miss or a "once in awhile" spark

What do you have for supply voltage?

How did you ground the HEI? Photo?