Electronic ignition ECU conversion to Ready to run wiring harness question

I don't really have any plans to run the original ECU again so that sounds like sound advice. Is exactly how I did my Coronet. Wired the ballast resister connections together in back and used the ballast for correct looks only. Are there any "surprises" I should be aware of using this type of harness instead of using what I have now? Will it just plug in and everything work and connect properly (other than the ECU components of course, which will not be used.)?