Is this on an 8V or 16V engine as the ZX12R bodies are perfect for a 16V size wise and injector wise, even if you have to move the outer 2 bodies in by 3mm and do something similar with the fuel rail to make them fit with straight runners.
Ahh...here speaks a man who must have a set in his sticky mits!

Im in the middle of making a manifold up to do this for a MK1 owning friend and the biggest problem Ive had is getting the outlet of the bodies to fit to the inlet runners as the bore of the body is eccentric to the fixing boss (Ill get a picture once its a bit closer to being done at the end of this week coming hopefully lol).
Please do post a pic.
I did think after I posted that a 16v is by far the easier, and best suited to the ZX12R bodies - that's that I was doing.
I managed to work out the spacings issues with slightly offset alloy tubes welded to a milled down 16v manifold (just the bit that bolts to the head), so leaving the bike ITB spacing the same, and removing all problems of fuel rail spacing etc. The ZX12R bodies are out by approx 2-3mm on the outside bodies as you say.
Not perfect for sure as two runners would be fractionally longer than the others...but easier than re-spacing the bike ITBs and re-doing the fuel rail etc.
However, if its for an 8V, ZX12R bodies are far too big (as said, about 46mm at the butterfly, 42-43mm at the outlet and about 48-49mm at the inlet)
Agreed...although, if you could get the inlet length long enough, you could claw back the torque you'd loose by having oversized ITBs (probably!) but there just isn't room on the 8v head if you stick to a standard head.
and the spacing will be way out due to the way the inlet ports enter the head. I want to do a crossflow head on injection in my own 8V Mk2 (Im a student at the mo though so I really dont have the money to do it lol) and Ive been looking at using early Suzuki GSXR600 bodies which are around 36mm bore which should be more than enough for the 8V's relatively rubbish breathing Whichever bodies you use, the spacing will be a nightmare due to the offset inlet ports.
Very true...
I know a few rally lads who use GSXR600 ITBs on 150-160 BHP cars and they work well.
The early ones as you say...single butterfly again.
If it were me, I'd just swap the engine for a 16v and go from there though...more to start with and much easier to get ITBs on as there's much more room to work with.
Almost always the bike ITB set up ends up longer from head to trumpet, than a similar set of Jenveys etc...which may cause major clearance problems.
Oh and as Ess Three said, dont bother with carbs, they may be different but they are not nice to set up and will give crap economy and emmisions (a big worry if you run a cat).
Amen!