Yes, if the injection tune up is more correct than your carb was, it will be more consistant and could have a greater ET. However, if your alky carb is matched to your combo and has the optimal tune up, you will not see any gains.
I love my flying toilet! Im not sure if you will see any real performance gains compared to an alky carb, but i tell you what, the throttle response is awesome, and they are so easy to make tuning changes to. For example at the weekend i was running demo passes at the local racetracks halloween celebration / last meeting of the year. There were few cars there running on the track so we were effectively hot lapping. On the way back to the pit after a run I decided to fat her up a bit, and was back at the front of the pairing lanes within 10 minutes! Yes, that included returning to the pit, changing the pill, fueling up, towing down to the lanes.