Taking apart a valve body for an overhaul

I have a non lockup 727 apart in my garage now, clutch pack and pump and all that fun stuff is apart like it should be... but this is the first time I've had a tranny apart, and I'm wondering what I should be looking for when I service the valve body? I have that Carl Munroe book and it has been an enormous help, but it doesn't really go in to detail about taking the valve body apart. Bottom line is I want the ******* thing to go back together after I'm done, and I kinda want to know what I'm getting into when I do go through it. I don't really know what to expect when I open it, and from what I've been told, it's stupid to do a transmission overhaul without at least cleaning out the valve body. Any thoughts on this?