Basically weld a new bung down your intake pipe ~6-8", then move the meth nozzle to the new bung and put the IAT where the current bung is. Or plug/remove the current bung, and move it, then install the new one. Either way, you want the IAT as close to the TB as possible without interfering with its mechanical operation. You need space between the meth nozzle so you don't get fluid accumulation on the IAT. The meth sprayer should be spraying a fairly fine mist, so you want enough space so that the meth can mix with the air a bit. As for distance, it's debatable, but 6-8" seems to be where most people land based on the things I've read.
Full disclosure: I've been considering meth so I've done some reading. I'm sure there are people here with meth that can provide advice from personal experience. There's obviously a number of different ways to get this done. There are certainly people who put the nozzle closer to the IAT:
If you are doing DIY, Tom's Turbo Garage has a great installation video for the VR4. He's running a MAF, but still a good watch (along with all his other VR4 project videos).