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I would look at a E450 Ford. Used a lot in the Para Transit field they are sold as surplus after 5 to 10 years. Some of the older ones had the 7.3 power strokes, stay away from the diesels after that. Fords own powerstroke being sold now was never offered in the E series. Most have the 6.8 V10 now.
You can look on a site called publicsurplus.com under small bus and find them almost any time. I happen to have a 48 f6 COE myself, (which I will not be getting to for a long time) the flathead is a snug fit in there so expect to do a lot of modifications to fit the cab down over the larger modern engines which are considerably larger.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.