Just use a gasket. You have enough screw mounts. I recently (as of yesterday) had to change my waterpump on my vehicle, what a pain in the ass to put it mildly. Anyway, the only thing keeping that sucker from leaking is a 1/16" paperlike gasket and it is not recommended to use any gasket sealer goop or it will cause the gasket to travel. If it is good enough for a vehicle waterpump then there should not be any worries about using such an application on a tiny copper waterblock.
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