69 notchback questions

Thanks 4 spd
I wonder if you or anyone can set me straight on the S part. I understand a true 69 formula S car is identified by a badge on trunk. Build sheet as well.
My question is what does the 340s badge on front fender indicate?
This car is unique in quite a few ways. The wheel covers 'vs ralley wheels. Column shift and bench seat vs buckets and floor shift. White seats with green dash pad and green upper doors.