SporTRACING, the 4.0 swap back would be basically the same.
Coastiejoe, that is a good point. I believe the most common requirement is that the motor be the same year or newer than the vehicle its going into. Most also require all original emissions equipment be in place. Here in Florida, we have no checks, so I wasn't worried about it.
Chad, good link. I've been a member over there for years, but never saw that one. Not really detailed, but he did the swap in about 2 weeks. If you notice the dates, it was right around Christmas time also, so who knows how much time he really devoted everyday though.
I had forgotten that the brake booster needed to be changed also, and he mentioned that the power steering cooler was different. No biggie, with a donor truck, both are at your disposal. The other concern was the A/C. Best bet would be to have the system evacuated and disconnect the lines. I was going to attempt to not do this, and try to reuse the 4.0 compressor, but I'm not sure it was going to work out.