That '62 Impala has either a 327 or 409 in it. The side emblem is just a little too unclear. Either way it's 4-Speed as the sign indicates.
From the post where I found the photo: Today on a new car introduction day at an automobile dealership the only visitors that you are likely to find there are car owners in the service department waiting room watching reruns on the television. Back in time car dealer’s showrooms would be packed with people checking out the newest, latest, and greatest models an automaker had just released. This set of photos is dated by the source to January 23, 1949, apparently the day the first all-new post-war Chevrolet was introduced at Southwest Chevrolet, located in Fort Worth, TX. Courtesy of The Old Motor