What do you mean by "file edits", just the added code in the actual php files? Yeah I don't care about saving any of that. I just want it to work like a fresh 3.0.7 but with my members and their forum posts intact running on the new version. So Impex is smart enough to not screw up as long as it was only the php code that was changed? What about queries that changed mysql info? I am positive that I have ran queries before for VB hacks.
Upload database_conflicts.php to your vB2 folder and run it. If it all checks out, you should be able to upgrade to 3.0.x through its upgrade script. 3.5.0 has more database changes, but I don't think they cause any major conflict. Either way, backup first and if possible, upgrade a test forum first.