a little help please

[Zuric]

I am looking for and old,old,old comic but I don't know the name, or the particular series.
I am looking for the comic(s) of when Superman and Jimmy Olsen went to Kandor and became Nightwing and Firebird.
Thanks in advance.

[Jor-El]

Superman 158 (1963) & World's Finest 143 (1964)

After that, Ak-Var and Van-Zee become Flamebird and Nightwing.

[Zuric]

Thanks for the help, and now I am off to find them.