Help!?! Just took apart my 360, and found bad things!

Firts things first, don't freak out! from the pics it looks normal to me. the valves are going to look like that in a motor with some miles on it, they are exhaust valves and they get hot. second i doubt you have a cracked piston as the motor would probably smoke and run like crap. since you are this far pull the pistons and clean them up. its probably just the carbon flaking off. last if your seeing any pitting on the cylinder walls that are deep enough to catch a finger nail just flex hone it and put new rings on. as long as the bore isn't too worn or tapered you will be fine. a re-ring and bearing change is always good insurance and cheap and easy.