There were 111 S code 390GT/4 speed GT/CS cars made. Before you purchase the one you speak of, I recommend you get a Marti Report for the car to confirm the car is a true GT/CS and a true 4 speed. Price can be all over the map depending on condition, #s matching etc. You will need the full VIN from the car to order a Marti Report. Check to see if the Seller has a Marti Report first. If not, let me know what the VIN is, maybe I already have the info and/or a Marti Report for the car. If you would, Please contact me at the email below. I would like to get the Full VIN and a copy of the Marti Report for the Registry if you pursue this. Currently there are 36 390/4 speed GT/CSs in the Registry. Hope this helps. Mike
ps. There were also 104 390GT/Automatic GT/CSs made.