According to an interview with John Romita Sr and John Romita Jr in Comic Book Artist # 20, July 2002, both father and son recall Romita pencilling and inking the cover. Colletta inks credit from Franklin Colleta, October 2008. Nick Caputo suspects Colletta did some touch up work on the Ka-Zar figure. John Trevathan previously cited Romita as inker via the GCD Error List (25 November 2008).
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.