The authors were Ivar Jorgensen and Adam Chase. At the time I didn't have a clue that Ivar Jorgensen was a name used by several different writers at several different publications. In this instance, Ivar was Randall Garrett. Adam Chase was used now and then by Milton Lesser, better known by another pseudonym, Stephen Marlowe.
The serial was later reprinted by Avalon books under the short title of The Golden Ape. I'm assuming it was lengthened by the authors, as it wouldn't have been long enough to fill even one of Avalon's slim volumes. It was also reprinted this year as part of a double volume by Fiction House. I don't know this is the serial version or the Avalon version.