FiTech EFI system

Thank you x3.

1) dead-end the original 2-wire plug that came from the original ECU to the original dizzy - easy
2) regarding the ignition.... If I go with the GM HEI, I remove the ECU and the ballast -correct? I think the coil - and + are easy enough - they are the "B" and "C" terminals of the HEI. But the HEI terminals "W" and "B" that would typically go to the dizzy now go where? It sounds like you have a similar HEI setup - just with the stock dizzy instead of the MSD 2-wire I have.
3) original Alternator voltage regulator must remain connected. One wire to alternator, the other is for power and presently goes to the ballast. If the ballast is removed, does the power come from the HEI "B" which also goes to the coil+?