Ok here is the rundown... since i have done it i know exactly the story!
I thought it would drop strait in, but it seems that the block is slightly different. I had to use the E front mount bracket from the engine, and it was 10mm off to one side, with a bit of drilling to reposition it was fine. But this may not be an issue with the DE bracket.
The DE loom needs to be integrated into the E loom at the fusebox near the battery, and again in the cabin leading to the console. But since i have all the wiring i can make up basic wiring diagrams. The AFM has different plug in the DE, but since its a front cut you wont have to worry.
The airbox is different, good oppertunity to put in a CAI!
The radiator pipes you will have to get creative with, i used the E top hose for the bottom on the DE and the bottom hose from a 2lt on the top of the DE.
Change over the water temp sensor.
Thats about it... the worst is the wireing, i'm happy to help there. But i did hear that whoever did the DE head swap used the E computer and loom???