I'm doing this exact swap right now. From what I have learned and can confirm next week is that the transmission itself will bolt right up, however the clutch will not. Apparently the flywheel mounts are different from an IDI to a powerstroke as well as the diameter. The powerstoke has a 13" flywheel and the IDI has a 12.75" flywheel, each having different bolt spacing where they mount on the crank.
Also make sure the tranny you have is for a 2x4 or 4x4, whichever your truck is as they are different from 2x4 to 4x4.