So there's only one partition, and the data that was restored wasn't restored into a disk image - it's actually sitting in /Volumes/Macintosh HD physically.
I think you'd be OK to delete that "Macintosh HD" folder from /Volumes, empty the trash, and then proceed with the migration util.
Maybe just before doing the deletion to clean up the disk space, fire up the migration util and double check that it can find the Time Machine backups and you can at least get it ready to do the work - no sense in deleting stuff if we aren't positive we can get it back again from the backup.
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-Scott
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