The cover penciler is identified in the letters column in Avengers (Marvel, 1963 series) #225; this information supplied by Ralf H. Kienzle, September 2005 (credit was previously given to Bob Hall). - Denys Howard
Letters on The Avengers #216. Letters from T. M. Maple, Dale L. Coe, David Taylor, Steve Lacy, Ted Saverio Naczek, Barry Dutter, Janet Bailey, and unsigned.