How many "H" code 71 or 72 Demon 340's remain?

I went with my friend to look at a demon 340 a couple years ago. It was a 1972 340 auto . Gy9 dark gold metallic. Numbers matching. Guy drove it through high school in the 70's. Parked it in the early 80's. Sat in his garage since then. Pulled the motor. Left it in the corner of the garage. Guy had no idea if the motor was original or not. I checked the numbers on the block. They matched the fender tag and vin. Guy could have cared less, even if i would have told him. Parked beside it was a 71 demon drag car with a 528 hemi in it. He was a drag racer. Not a resto guy. Paid 4000 for it. Sold it to a guy in prince edward island. Still good cars out there to be found. How many are left? Your guess is as good as mine. I have a 1970 dart swinger 340.