late 50's early 60s taillight and tailfin test... difficult

http://www.americantorque.com/game/tailfins/

I got 45 of 56 correct, its really rare to see these Olds, Pontiacs, Buicks, DeSotos, and Packards

instant easy identification of a race hemi, or a street hemi, by looking at the heads

lots more than just this one image, a full article and gallery at http://www.hotrod.com/features/1503-how-to-tell-the-difference-between-a-street-hemi-and-race/