If you insist on sending a revised 1040 with 1040-X, you'd better write "COPY ONLY -DO NOT PROCESS"
in bold on top of it.
If it is entered as a 1040 then you will have submitted two tax returns.
This causes problems, trust me on that.
The 1040-X instructions say (Page 6):
"When you file Form 1040-X for a tax year, it becomes your new tax return for that year."
