electronic ignition help????

I just bought the orange box and distributor kit for my 273 but havent did the install yet. I expect the car to start and run much better with the new igntion system.
I did change over a performance 360 from points a couple years ago and noticed big improvements. I suspect must 40 year old distributers don't have properly working vaccum and/or mechanical advances. Plus the electronic system just does a better job controlling spark