I'm looking for some Marvel crossover stories from the 60s, 70s, or 80s featuring two or more Marvel heroes, who don't normally appear together, on some sort of adventure. I like Marvel Team-Up but it's basically a Spider-Man and guest series and I'm looking for something with more variety, different heroes. Could be a storyline or one/two issue arc.
Big events are fun but I really like stories with only 2-4 characters. They're more personal and seeing interactions between characters that are from different areas of the Marvel universe is really thrilling to me.
If anyone could recommend some issues/series/storylines I should check out it would be really helpful! Thanks!