Zip lock baggies and a sharpie are always a good idea for remember what goes where. If all else fails, you can use this too:
http://www.turboninjas.com/mk3supra/others/Mk3 Engine Fasteners.pdf
You need a big socket to get the union off at the back of the head as well (pretty sure I used a 1 1/4"). You might want to pick up a 3/8" torque wrench for some of the finer/lower torque bolts/nuts. Cam caps come to mind for sure.
If most of the fastner hardware is stock on your car, then this is useful, otherwise follow the instructions in each section for torque specs.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=B&P=2
If you do use that torque worksheet though, remember...the diameter is the actual bolt, not the size of the head! (ask me how I broke a bolt in my cam...:nono
If you want to take the head off with cams in, you need a thin walled or 3/8" socket for whatever hardware you've got holding it on (ARP studs/bolts or stock bolts). I know the ARP is a 12 sided 14mm. This will allow the socked to have JUST enough room to get between the cam and the casting when the cams are set with the matchmarks up (or TDC). Sometimes you have to wiggle the cam a little bit to get the socket to slide down, but it works!