Ailing engine (Updated after teardown)

The RA needs of the cometic gaskets is not crazy. I searched the conversion to sandpaper grit to get an idea. I would not coat them, I did once and it leaked a bit. Dry from now on. Definitely stud time. Make sure the center rivet doesn’t get pinched between the head and the block. I have had it happen. I just remove it. A 50 RA is between 120-150 grit.