How rare is a GA4 paint code demon?

Well, it's no one of one!

Here's one 1972 Dodge Demon By Patrick Alessi | DodgeDemon.net

Here's another 1972 Dodge Demon 340

and another 1972 Dodge Demon 340 4 speed for sale: photos, technical specifications, description

5 minutes on Google, 3 1972 340 4 speed Demons in GA4.