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

Anyone have a guess at how many "H" code Demon 340's are actually left? My Demon is a "whole" 340 car (VIN LM29H2B182***) with the exception of the motor which is a 1972 340. Transmission and interior is original. Was restored in Ohio sometime in the late 1990's. If anyone recognizes it let me know.

Since there is no registry and I have no idea myself even if it's 10% there can't be many. It's pretty fascinating to research these cars.

My guess is:

1971 – 10,098 were built maybe 500 (5%) remain?

1972 – About 8,700 were built maybe 250 remain? (I've seen only 4 in Minnesota)

Let me know if you think I'm high or low on my guesses and give me yours.