First you need to know the diameter of the bolts and the type of thread ie 3/8 N/C or 5/16 N/F then look at the type of bolt ie plain steel or high tensile SAE grade 3, 4, or 6, once you know this go to a general purpose bolt torque chart, and derive the torque spec info.
If the water pump is cast iron use the full torque specification.
If the water pump is alloy then reduce the torque spec 10%
Below is an example of a general purpose bolt / nut torque chart
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