There should be more updates on LPG soon; I haven't started a project diary just yet on my car, but here's the planned setup:
Built 1UZ motor with Eaton M112 supercharger in a 1994 MKIV Supra with A/T. No intercooler, but MW injection, pre-supercharger. 10 psi or so of boost and 10:1 compression.
Dedicated Prins LPG injection system with the Prins ECU working as a slave to an AEM standalone EMS. No liquid fuel system at all, and the Prins (Keihin) injectors mounted in the intake manifold where the liquid injectors are/were.
The engine is currently at the builder - we're putting some exotic stuff in the heads and valves to improve their longevity on LPG, and I'm in the process of acquiring the LPG system and sorting out how I want the ECU's to play with each other. My goal is to have a very streetable "cruiser" with this project, not a monster. 500 RWHP would be nice.
I would encourage anyone considering LPG to have a look at the Prins system; IMO it's head & shoulders above the Italian systems, and it's also their 3rd generation product so they've learned a few things about LPG. It's also a combination of Dutch & Japanese hardware and quality.
John