I have a 4500 from ThumperDart. It starts, runs, and drives better than any other carb I have ever had. I would gladly put it up against any of these 'self tuning' throttle body kits for overall drive-ability.

And keep in mind that unless the cam is very, very mild, the idle and low speed 'self tuning' on the EFI will need to be locked out and tuned manually. If a cam with much lope will be used, then the reversions will confuse the EFI and force the manual tune. Just like a carb.