Torrensen is the place to go. You will want both the manual and the parts catalog as well. The manual does not list the part numbers. It also does not hurt to purcahse an after market manual as well. These will give you a little different take on how something is done.
I have the same boat and engine and they are a blast to re-build. Just remember that you will need all metric tools. And it is also easier to do the work if the engine is out of the boat. That way you can get to every part and you can even bench test it once you are done to make sure it works before you put is back in the boat.