This issue is a variant of Conan the Barbarian (Marvel, 1970 series) #116 [Direct].
Buscema pencils and Adams inks credits from Steven Tice. Nick Caputo adds that Giordano also assisted on the inks. The cover reprints the first page of the "Crawler in the Mists" story from the Power Records book. Original art page is whole stats. Additional art information from Michel Maillot and the John Buscema checklist.
Story takes place between issues #12 and #13 of Conan the Barbarian. There are three additional pages penciled and inked by John Buscema and additional scripting by Dematteis. Original story from the Power record comic book was 19 pages (additional info by Michel Maillot and the John Buscema checklist).