I know of one for sale which has been for sale for some time. It's at the Imperial Palace car museum in Las Vegas. IIRC, they are asking a substantial amount for it.
There was this post recently, it doesn't give numbers specific to dry sump. Mines a dry sump, but it's from the UK. http://www.ferrarichat.com/forum/showpost.php?p=139676166&postcount=1
That's the thread & it appears to suggest that there are 365 rhd carb all of which as I recall are dry sump
UK RHD cars were dry sump, Australian RHD carb cars were wet sump. Not sure about the Japanese RHD version, though. Robert
The 365 RHD cars appears to include 154 fibreglass cars leaving 211 steel GTB's in dry sump form which is not many really. One tends to think of the 308 being common 12,000 or so made but in RHD dry sump GTB form its pretty rare.
The general belief is of the 712 glass cars 87 where RHD.How many of those were Dry sump don't know. How accurate italian figures are ...... who knows. I have seen very early original steel cars with the full amber indicator lights. Go figure. It would be good if the actual figure were known to all. Mg