Incredible Hulk vol. 3 #74- Hulk vs Iron Man I (as a Gamma Person anyway)
Stark designed a suit to absorb gamma radiation, but the suit leaked and infected him. Stark goes nuts. Hulk lets Stark think he beat him so that a second bomb, an anti- gamma bomb, would go off in Stark's face and defuse his gamma infection.
WINNER: None, SCORE: Hulk 0, Iron Man 0