As Lucien said, all of the Ferrari's from the States or Japan will be LHD and the conversion costs will far outweigh any benefit from importing. Also, I doubt that you could import any car that is available locally and under 15 years old, unless it is a personal import. If you were able to import one, I would be looking at one from the UK, that way you don't need to convert it to RHD.
Why don't you ask these guys who have already done it. When you find out, please let me know. I would love to import a Ferrari at a much cheaper price. mmm F355
I do know a couple of companies who do this with 15 year old Porsches, but they are much more common and LHD-->RHD conversions are much easier and cheaper.