Ever notice that the 1998 Shop Manual refers to a section 303-03-41 Coolant System Draining, Filling and Bleeding? The section is there but it discusses draining and flushing only. There is no procedure for filling and bleeding.
I can't believe the Manual procedure for draining coolant is effective for the block. The low point of the block can't be drained unless the sensor hole is down that low. Removing the sensor is not mentioned in the Manual.
Also, there should be a vent at the head(s) so air can escape when you fill the system. Otherwise air can get trapped up in the high point of the block. I think it is too risky to let an engine run only partially filled while waiting for the thermostat to open in order to push the air bubble through.
