I thought 5.2 and 5.9 oil pans were different?
Yes, this swap has been done thousands of times, but most folks just switch to a carb. My main concerns aren't the obvious, physical stuff. It's all the technical details required to use the factory EFI, ignition, and computer.
Thought of something else: electric fuel pump and return line to the tank. The current tank is in pretty bad shape, so I'll likely replace it anyway and get one with with an in-tank sump and pump.