Here is the link to the restoration shop. Like Turk said give George a call and ask for his opinion. I would listen to whatever he tells you about wether or not the engine can withstand this kind of repair. I was suggesting the other company because they have done a freeze cracked 427 block that I know of. The engine builder who then buildt the engine said it was a very nicely done repair. The freeze crack repair was $1000.00. If your block is a rare date then it would be worth the money. Good luck and I hope it works out for you, Sal.
Crow Welding