Level 15

After you file

you don't include the revised 1040 because 1040-X reflects any changes there and becomes your new tax return.

This is not stated explicitly in the instructions. instead the instructions state to include forms with an attachment seq no.

1040 does not have an attachment seq no.

in certain unusual circumstances, a form 1040 would be included with your amendment, so they don't say that you should not include it