I don't know the exact number built but as Barry said, there were a good number of them. My 70 440 six barrel Cuda is a bench seat column shift auto, standard dash car.
It's about as basic as you could order one if you don't count the AM radio, Sure Grip rear end, Shaker Hood, and belt & wheel opening moldings.
Basically I think it's cool for what it is more so for what it insn't.
From the outside the car appears to have buckets due to the individual seat backs sticking up.