Stock carbs are capable of far more than your going pull out of it. That is if your only trail porting and adding 4* of timing.
Buy a timing plate. Degree keys scare me
2nd edit: pods are the way to go. I have had mine caked in mud and drove thru shallow creeks. Just take your time in the water. One of the Zillas on here has a picture of his bike with pods and it's real muddy. Hunt that pic down to give you an idea of what pods can handle, if taken proper care of.