The excerpt contains a few parts that can be identified as dialect:
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"my boy" - This phrase is often associated with a colloquial or informal style, which gives it a conversational tone that is characteristic of certain dialects.
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"let it go at that" - This is a colloquial expression that reflects a conversational manner of speaking and can denote a regional or informal dialect.
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"all 'll go well and the goose hang high" - This expression uses idiomatic language that adds a flavor of dialect, suggesting a more informal, possibly regional way of speaking.
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"whale the stuffin' outa you" - The phrase "whale the stuffin' outa you" is an idiomatic way of expressing a physical threat or punishment, and the informal wording contributes to the dialectical tone.
Overall, the dialect in this excerpt is conveyed through the informal, conversational expressions and idiomatic phrases that reflect a specific character's way of speaking.