correct Demon hood question

I dunno about the numbers but the 71s were dual-scoops; one on each side like the 70Swingers, and 69 Superbees; and the 72s I think were snorkels,Which I don't care for.
J54 is listed for 70 to 74
V21 for 69 to 74.
So the codes don't seem to be of much use.Sorry I couldn't be more helpful.