HEI distributor install help please

So.. seems simple enough to me.. going to put this in my 1988 Ramchager, the old dizzy is worn out, picked this up at Petit Jean Mt.
I read this and I am still a bit confused on the ECU, do I leave it plugged in or just unplug and do this, ( copied from another thread ) wish I could see a wire diagram #-o

Any help would be great :color: Thank you :glasses7:

Remove the existing distributor, ignition box and ballast resistor.
Replace the coil with a 12V low resistance coil like the pertronix flame thrower II.
Connect the ballast resistor wires together, bypassing the old ballast resister and applying 12V directly to the plus side of the coil.
Connect the two wires from the distributor to the coil