Heads Cam And Intake Swap ......
http://www.ls1howto.com/index.php?article=23
Same thing goes for compressing the springs - Crane makes a nice tool that allows you to change two springs at the same time.
only other thing I can think of is a set of gear wrenches to get hard to reach spots.
Intake, again, a very simple job.
If you don't know how to assemble heads, I'd probably let a professional do it.
The best thing I can recommend is getting a manual and reading it over a few times to gain some confidence. Make sure you're NOT reusing the same heads bolts, use the moly lube, and follow the torqueing procedure to a 'T'.
Other than assembling the heads and degreeing the cam, it's a pretty straightforward engine to work on.

