I run 2 Gas Research (GRA) throttle bodies and two GRA B2 converters, with a 190L tank.
GRA recommended running dual throttle bodies in a primary/secondary configuration. I did this at first and found it so boggy and soft that I felt like someone had yanked my BBF and replaced it with my neighbour's Hyundai engine. Boy did it suck. I changed the throttle linkages so both throttles open at the same time and balanced the jets so they acted like two primaries. Wow - what a difference that made. It felt like I had a V8 again.
Although they are supposedly almost infinitely tunable, the idle, transition and cruise circuits are all linked too tightly together. This means you might get a perfect idle, but cruise and transition get messy. You start to fix cruise and although it gets better idle gets worse, so you have to compensate a little in your idle settings. Then you find that there is a big fat lean spot when you stomp on it so you correct that and now idle is so rich your beginning to think you're gonna gas-axe something shortly so you start messing around with idle again and cruise goes up the $hit again. I've tried the different sized restrictors/jets as recommended by GRA and in the order recommended by GRA and yet lambda at idle hangs around 0.84, my flat spot hits 1.24 and cruise is ok at 0.98 - 1.02. I've traded idle for cruise and given that you won't ping if you lean LPG out, I traded out a lot of the progression too, hence the flat spot. I could certainly do a lot better, but I'm not up for all the dicking around again. I'm now used to EFI. Change a value, make it happen, move on.
GRA's setup is a million miles ahead of any venturi ring, but dang it sucks if you're used to quality fueling. Infinitely tunable doesn't mean it's fun to do and you can get it right with ease.
If you have the choice - go INJECTION. More power, more tunability, more precision, more fun.