[eagle]

I did it on a Model T head with a nasty crack. Worked great. After it was well cured I refilled it, then when that was well cured I filed and sanded it smooth, then paint. Never leaked, couldn't tell there had ever been a crack. You may want to carefully inspect the rest of the block, frost cracks often times show up along the side of the engine. I used the original JB weld, the quick type doesn't seem quite as good. make sure you do a good job of mixing it. Sounds like your prep is good.