Help with 413 Build please

daredevil said

I was told the blocks were thick as hell. this was because they were built for use in bread trucks and such.

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I had a 426 wedge bored .070 back in the day to take stock 440 pistons. The machinest said the same thing, block was plenty thick. I built it, dropped it in a '67 Barracuda. That thing kept breaking u-joints. Nastiest car I ever owned!