"The most challenging part would be fitting the intercooler. Remember what Ford used to do with the 7.3L PowerStroke that didn't have an intercooler when fitted into the Econoline."
On that note, you could possibly get an 89-90 cummins 5.9- they were not intercooled, & would overall take up less room
Other than that, the 4BT would be better (if you can find one)
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