My two cents......
If you are pulling the engine for the heads, take a look at the main and rod bearings. You're taking the pan off anyway. That way, you'll know if they are in good or not so good shape. Have a good look at the cylinders as well for any issues. If you aren't (and I didn't see that you were planning to) changine the lifter/push rods/rockers...... be sure to put them back in the same position they were removed from. I'd recommend replacing the main seals (front and rear) if they are leaking. No better time than the present to do them.
The cam isn't a bad swap, but it will require removing the front engine cover. And, you've got be be able to pull off the stuff on the front of the cam and press them back on. Some shots of the process in my 6.9 crew cab gallery in the Webshot link in my signature.
Have the heads tested, inspected, and machined (if needed) by a shop that knows what they are doing with these IDI's. Pay particular attention to the valve guides. If they are worn.... now's the time to fix it...... a dropped valve is not a fun problem to have.
As far as gaskets.... I've gotten some great prices on head gasket sets and valley pans from Reliant Gasket. They have an eBay store. If you can't find what you want on eBay... just call them. They have it, just not always listed on an eBay auction. By the way, their stuff is Victor Reinz.
With the turbo... I'd also mod the valley pan baffle to ensure good oil drainage from the turbo. Again, photos in my webshots. Also, pick up a tube of Permatex Ultra Copper silicone for the oil pan. You should get some good silicone with the Valley pan (If VR brand) and make sure you are generous with it on the rear of the block. That area is too small (IMHO) and you've got to put pleny of silicone there to keep the rear of the valley pan from leaking.
You will need to get a set (4) of dowels for the heads. Get'm from Ford, roughly $12.
I'm a fan of ARP's torque lube for the head bolts/studs. Great for ensuring you get the correct torque on those heads.
If you've got any questions about the head gasket job.... just ask away. I've had to do that on the crew cab not too long ago.
Heath