Turbo EFI TI? Sure, why not? It's only money...
The 1.8 T-IV has been done. The one that I know of offhand uses a whole bunch of CIS parts, mixed (I think) with stock (914/1.8, L-jet) manifolding.
The 1.7/1910cc and 2.0 914 Turbos have been done as well. One 2.0 setup used a single draw-through carb setup and was very limited in terms of boost. The others have used a Miller FI CIS setup (1.7/1910/2.0; the engine kept growing) and a very modified stock-type D-jet EFI (2.0).
Look through posts on the Shoptalk Forums Type IV and Forced Induction BBS, there will be some specs and some discussion from Evil Ed (1.7/1910/2.0) and EJM (1.8) about their setups.
--DD