This issue is a variant of Captain America (Marvel, 1968 series) #223 [Regular Edition].
Credits from Nick Caputo, Feb 2011, derived from info in The Comic Reader, although Nick is uncertain if the Byrne pencil credit is correct. Marvel Database wiki lists only Ricardo Villamonte as cover artist.
cont'd in Captain America (Marvel, 1968 series) #225
Letters from Christopher Lake, Alan Stewart