The 70s Superman Family series was a consolidation of Supergirl and Lois Lane into Jimmy Olson (his series numbering continued into SF). When the book expanded to dollar-size, "Mr. and Mrs Superman" (usually set on Eath-2 in the 50s, except for issue #200), "Private Life of Clark Kent," and (maybe) Superboy were also in the lineup.
#207 featured a Roy Thomas-written story about Universo trying to trick SG into retrieving a Kandorian weapon for him. The Legion turns up on the last page conveniently standing in formation in the plaza in time to note Kara's success, even though they presumably would have no idea what had just happened.
#200 is not LSH-related, but was a fun "20 years in the future" (1978's take on 1998) single story woven through the various features, predicting something close to the Internet (but also with plenty of mis-guesses). It's fun in its own right, and one of my favorite Superman stories of the 70s. We also see Lois and Clark with a grown daughter named Laurel, the closest thing we get to a LSH connection.
I have no idea what the Showcase collections are including, or how far they've gotten.
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