The way I would set this up is
+ve wire to the +ve terminal on the Coil
-ve wire to the negative of the coil
Wire from points. Would be the old -ve wire that went to the coil. Remember this box is now triggering your coil so you will have to remove the link in your old system otherwise the system just bypasses your new box and runs the standard system.

The trigger from the coil (the old negative wire) is now to goto the hi ignition box as it's now telling the box when to fire in which case it sends the signal down to the coil to fire.

I hope I have shed some light on this.
cheeers
Damian