The idle speed being set electronically at 1500rpm is far to fast and cannot be altered by the inoperative adjuster, which indicates to me that they could not get the engine to run any slower on EFI.
The idle speed is fixed in the map. Again, an easy fix with TuneECU.
One thing to watch out for though, is to make sure that the butterflies seal off perfectly. If not, the IACV won't have full control over the idle revs.