If memory serves me well, then the starter mount is also the engine mount bracket. Now when you refitted the gearbox, the starter should automatically realign itself, however, wotnot happens. Try, with a jack under the engine, loosening off everything at the front mount, including the starter. Make sure everything is free to move a little, then retighten everything back up, starting with the starter, then the mount itself.
You could off course just try to clean up your earth straps first. They may have got dirty during the clutch change process!
