Maybe a procedure I used when I replaced the water pump a few months ago will help. Maybe not.
Twist a stud into the hardest to reach hole finger tight. If you don't have a stud buy a bolt and cut the head off. Slide the pump onto the stud. Tighten the bolt into the other hole tight enough so the pump does not move when the stud is removed. Twist the stud out and twist the bolt into the hole finger tight. Loosen the other bolt to finger tight then torque both bolts down evenly.
TRUE GRIT
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