A while ago we did a V10 to Diesel swap on my parents Bigfoot and ever since I have just been drooling over his fuel economy, range, and ease of climbing hills and taking on head wind all in cruise. For a few years I've had a 60K mile 7.3 sitting on a pallet just waiting for the right project to set her into. I finally bit the bullet and decided this little mini Bigfoot was going to get it. My parents swap went super smooth as we had same year donor van, but mine was a different story. We had a 2000 truck engine, with a 1996 donor for wiring. there is quite a bit of different between the new 7.3's and mid 90's so the swap took a lot long and a ton more chasing issues and solutions. I'm currently putting shake down miles on her before I attempt and long distance runs with the family. So far so good.
Also wanted an auxiliary fuel tank, opted for the same set up we did in my parents, a factory front to back style (along the frame) fuel tank trimmed down to clear the T-case, this tank became my main tank while the aft tank became the AUX and pumps into the main tank when needed.
Very Tight Squeeze, 4" turbo back.