In general, when paper filing, do not include your old 1040, nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
In this case, include only Forms 8606. Leave Lines 1-23 EMPTY.
Mail to the address shown in the current Instructions for 1040-X.
Done this way, you sign 1040-X, not 8606.
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