This issue has variants.
Colletta alterations on Ka-Zar per Nick Caputo, confirmed in an interview by Romita. In John Romita..And All That Jazz! Romita stated: "If you look at my first Daredevil cover, I didn't do half of those pen lines in Ka-Zar's arms and legs. Most of them were done by Vinnie Colletta."
Franklin Colletta originally credited his father with inking the entire cover.
Ka-Zar last in X-Men #10. According to interviews with Romita,he pencilled the first two pages on his own and Kirby provided breakdowns from page 3 on.