VSSMigrate over the top of existing files

We currently have projects split between two source systems, VSS and
SVN. We want to move everything out of VSS into SVN. Apparently,
someone tried to migrate in the past, so there's very very outdated
branches already in existence in SVN.

If I delete the existing folders in SVN, when VSSMigrate goes to add
new files, it's going to choke, right (trying to re-add files that
were deleted?)
If I run VSSMigrate with things the way they are now, it'm pretty sure
it'll choke trying to add existing files?

SVN Obliterate would be perfect for this, alas it seems to be the
feature everyone wants but nobody wants to write...

-- 
-Chris
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