It's a challenge. To get the TBI working on my W350, I scavenged all the parts I needed and formulated a plan to make it happen. Since I went Megasquirt it was a little bit different than swapping factory parts. I started with a used Holley ProJection 2bbl kit, and built the wiring harness with the extras I needed. You will need a high pressure fuel pump and likely a return line for excess. I used a TBI tank that was a direct fit. I would suspect a van tank would swap with minimal fabrication. If you have the patience, it shouldn't be terribly difficult. Plan on spending some time to get it working correctly.