I got a little further today. I installed the new seal and O-ring in the pump. I found a great write up from South Africa, and it mentioned using a string or hooked wire to pull the governor forward while installing the top. There were also pictures of the clocking of the splines for the throttle lever, which was helpful because I had neglected to mark mine when removing the lever.
Back on the motor I drained the coolant, and removed the oil filter, then dropped the starter to get to the bolts for the oil cooler. It came loose nicely then I mopped up the mess on the side of the motor. That's where I left off for the day.
