I was about the same age when I saw that fight on tv. It was one of the last title fights I remember ever being shown on network tv, also. I'm going off of memeory right now, so this may not be correct, but I don't even think Kim was the original fighter Mancini was supposed to fight. for whatever reason, the other guy couldn't fight and they had to scramble to find a replacement the week of the fight (I think). Also, if I remember correctly, it was like a mid-Saturday afternoon fight on maybe CBS? It wasn't like the Wide Wide World of Sports broadcast, I don't think.
But yeah, amazing that something like that was televised 30 years ago.