Combination of EFI head and MFI inlet or MFI head and EFI inlet just causes unnecessary problems.

I modified an RS1600i inlet but still use a MFI head.

In your case I'd use an adapter to make the EFI tb fit to the MFI inlet. Going full ZT will make things easier. Unless you're using Escort/Fiesta 16V setup, most of them also have a crossover pipe.