Lester del Rey, Sam Moskowitz, Forrest J. Ackerman. This is probably the presentation of the Big Heart award, but the Locus list doesn't go back to 1974, I can't find another list, and Forry says in Mimosa 23 that the award was created shortly after E.E. Evans died in 1958. My notes say "First Fandom award", which is clearly wrong. Since it was my third Worldcon and I wasn't much involved in fanzine fandom, I'm willing to discount my own notes.