This puzzle taught me a lot, about people having 330LM noses put on their 250GT's. Some even had it done by Ferrari.
Yes, I believe the factory only actually made a small handful of 330 LMBs, four at most although two of those are thought to have perhaps been 250 Lussos with a 330 LMB nose grafted on. No doubt there are at least a dozen now doing the rounds of the auction houses...!
How anyone could desecrate a 250 Lusso, which I consider one of the most beautiful cars of all time, is beyond my comprehension..!