The main writer for the Atlas fantasy anthologies by this time is Carl Wessler, with rather more stories than Oleck; Wessler's are known from Robin Snyder's transcribing the writer's records in History of the Comics.
Marvel Tales was cancelled with #159 in the Atlas Implosion in 1957; Journey into Mystery was too, with #47, but was reinstated a year later with a few issues out of inventory (although no Oleck scripts) before the beginning of the proto-Marvel lineup (much more work from Jack Kirby, for one) leading into the monster phase.
Jack Oleck scripts
in Journey into Mystery
|Aug/56||#37||The Voice in the Night
|Nov/||#40||How Harry Escaped
|Dec/||#41||I Switched Bodies
||#43||It's Waiting for Me|
|Apr/||#45||What Happened to Harrison|
|June/||#47||Bring Back My Body|
|He Sits in the Fog!|
in Marvel Tales
|Nov/||#152||When Mongorr Appeared
|Dec/||#153||It Can't Be Done!
||The Last Man Alive|
|Feb/57||#155||Man in a Trance|
|Apr/||#157||The Man Who Was
|The Man Who Changed|
|Aug/||#159||The Last Look|