I have found in the past that it’s good practice, particularly on the aftermarket pumps, to first fit it up to the engine with no gasket or seal on place. Run the fasteners down finger snug and then back them out a couple turns. Then slide the pump upward as far as it will go and, using a feeler gauge, make sure it completely closes the gap between the pump and the head. I’ve seen at least one pump where the casting was so bad that I had to clean out the holes with a rat tail file in order for it to slide all the way up.
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