The side of the box tells you every thing as to fitment. I have no idea how to tell the production date if that is what your concern is. Holley stopped making them long ago.
Thanks, I have it installed on my '40, mine went south.....I just wanted to know when it was made, it is so cool to put in a hot rod build, being a genuine Holley piece and it runs better than ever.
I think it might be older than mid 50's. The label says Detroit, MI and they moved to Bowling Green, KY in 1952.