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I think you should take the engine out of the car and tear it down. Take to a machine shop with proper honing equipment and do it right. If the engine is apart you can lay it on its side and use muriatic acid to eat the aluminum away. DON’T get it anywhere near the Babbitt or it will remove that for you also. The aluminum will be so hard and stuck so well to the cylinder walls you may damage the cylinder walls trying to scrape it off with anything else.
Just trying to hone it off is not a good idea for the stones or the cylinder wall either. As Brent has stated it could make the bore egg shaped.
My 2 cents