This was the first appearance of Shang-Chi (and Fu Manchu*) in Marvel comics, and my first “kung fu” comic book. Loved it! Great action and story. I’m not sure whom I liked more as a kid, Shang-Chi or Iron Fist. Luckily, they both had their own comics and sometimes even showed up together.
*Of course, Fu Manchu had already appeared in DC comics, specifically Detective Comics #27.