Removing the IP on an IDI Van can be a bit of a chore, but not impossible. Here is a video of me doing this.
In the video, I talk about some injector line retainer clips that I modified. I have photos of my modification and a pretty nifty write-up here:
No warranty. You are responsible for your vehicle. For novelty use only. Not responsible for anything or anyone. Not responsible for damage to your vehicle, you, or anyone or anything.