Bratton's is clear on how to install the new style bearing but leaves the rest up to you..IMO water pump issues are the result of a root cause,belt load.
modern automotive style belts should not be used in a model a application,especially an alternator car,use a"B"sized industrial belt or in the parlance a fractional horsepower belt.its a much better choice,they transmit more power at a reduced load.The offset is they dont have the life rating of the harder and less pliable automotive belt..in alternator model a application they tolerate a smaller pulley,higher load rendering less load on the water pump bearing.