STRONGLY recommend that you change to studs and nuts for this connection.
Studs should be non-corrosive: stainless is good. The Moyer kit for this job uses stainless studs. Some have done it with stainless set screws from McMaster. Did mine with brass all-thread from HD. Depends on whether you're raw water cooled (use stainless) or have a heat exchanger and glycol (brass is fine).
Install studs with permanent sealant - I used JB-Weld, on the stud and in the hole. The holes in the block should be chased with a tap and cleaned with solvent before stud installation.
Once the studs are installed, clean up any excess sealant then install the cover plate and gasket - I like to use the blue silicone sealant in this location. Nuts and washer of your choice - stainless looks good. No more leaks.
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