Ok gents, cheers. The bike carbs I've got in the garage aren't. They're throttle bodies (off a GSXR 750), so perhaps I'll use these and go for a full ECU such as MegaSquirt.
I was trying not to spend too much on this, but it looks like either way I'll need some form of ECU, so might as well go the whole hog and buy a dedicated ECU.