TALES OF SUSPENSE #52, 1964. Kirby only drew a handful of the early Iron Man stories, but of course did draw the covers for quite a while. The Crimson Dynamo is a pretty goofy looking villain, but doesn't the Black Widow look nice. Inked by George Roussos.
GIANT-SIZE CONAN #5, 1975. Inked by Joe Sinnott, with some corrections on Conan's face, probably by John Romita. Not sure why the correction, since Kirby's version was fine, recognizably Conan. Sometimes I think they just meddle with the art for the sake of meddling. The only Conan art Kirby did for Marvel, although he did draw the character a few more times that have appeared in fanzines and other books.
WESTERN FIGHTERS #1, 1948. A nice S&K cover from one of the Hillman books. Love the inking on those, and the folds on the clothes.