Congratulations, Drew. I'm sure happy for you.
Perhaps as you're working on a display for your Red Hearts, you could begin to collect any articles, information, and personal stories on this set. Maybe you already have a bunch of that. Do you have a reprint of an original advertisement, which told kids how they could get the cards in the first place?
Somewhere I have my 1969 Wholesale Cards Co. mail order catalog. While the prices listed are so low it's sickening, it provides a way of understanding how a young hobbyist such as I could, and did so, get the cards that year.
No doubt you probably know The John Morrell Company kept a large number of the leftover cards should someone want one. Until at least the early 70s, one could write to them for a set. I have no idea if the interested party was charged money, or Morrell just sent them a set for free, since the promotion was long over, and to convey the highest possible public relations.
It is a very beautiful and interesting set, to be sure.
Nice going, again.
---Brian Powell