I beg to differ. OK, it won't make any more peak power, but low & mid throttle response is much better with EFI, especially on start-up & in cold weather.
If you've lived your life with Holleys & chokes that never work properly, you won't know yourself if you switch to a good EFI system. It makes an older car a pleasure to drive.
Dr Terry
If the carb tune up isn't very good then i'd bet there would be some power gains to be had. Maybe not a lot, but some.