It os all dependant on actual bore size. If the bore is .729" or even close, a drop in gauge will be accurate. But if it is much oversized, it is not.
If your drop in is measuring Cyl on both sides, then the bore is likely oversized.
If only 2" was taken off, you should be getting a light mod measuremrnt. Assuming full chokes on the original 30" length.
Another thing... The letter may not mention choking. Likely just patterning info.
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B. Dudley
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