Before you decide to junk that unrepairable engine block watch this...

I have one of those kits good stuff save a 64 slant block for me. Been around forever also!
My neighbor found a '35 Nash Lafayette in a barn two miles from here. We dragged it out and brought it home.

Looked at the engine and it had about 50 holes drilled into the side of the engine block and brass machine screws holding a brass plate custom cut to the contours of the block. That patch fixed a freeze crack that occurred 50 year earlier.

The Nash was still running in the 1970's and later.