while you have it all drained, spend the time and $$$ now to replace all coolant hoses, including those to the rear heaters.
If they are fine and nice soft rubber, as if they were already done recently, then there are usually two hand-valves you can close for the heater circuit, so it won't drain: one at the back of the motor head, and another where it feeds back to the lower radiator hose. It can be hard to get the bubbles out of it. The rear heater in my bus is higher than the coolant-fill bottle above the front of the motor.
Other than that, I think the pump job is strait forward. Was on mine, but mine is newer.
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