An update, I cleaned up each hole with 240 grit sandpaper. Coated mounting surface with Permatex #2 Non-Hardening Form-A-Gasket Sealant. It’s like the brush-on Aviation sealant. Then coated the mounting surface of the Dorman 1635C Brass Freeze Plug with the same sealant. I purchased the Proto 2314-4 driver on eBay for $8 including shipping (see below). I used a 10” long 1/2" extension with duct tape over end and NAPA 48 ounce sledge with Proto 2314-4 driver to drive the freeze plug in, using the outer lip of the freeze plug. I stopped when the front of the driver was flush with the side of the block. I repeated this procedure for the other holes on the side of the block. The only variation is how long I had to make the extension in order to hit it with the hammer. So far, the repair seems to be holding. Thanks 65 Sporty and Train Tech for your help.
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