Sal Buscema credit per Rich Donnelly, Karl Mattson, Steve Whitaker, Nick Caputo, and Bob Ford. The original indexer and Carl Gafford credited Don Heck.
Inks and colors:
Roy Thomas and Bruno Andreacchi stated (http://errors.comics.org/show_bug.cgi?id=4233): Tom Palmer on both
Sources for letters credit are The Official Marvel Index to the X-Men (Olshevsky 1987), The Official Marvel Index to the X-Men (Ward 1994), and Official Index to the Marvel Universe (Vandal et al. 2009).
Sunfire's next appearance is in SUB-MARINER #52.