Hi all I just took delivery of my first stovebolt, a 1940 1/2 ton (feels like Christmas). I'm completely new to this game and will have a lot of questions. The first one is what engine do I have? I have read the tech tip on 39-40 Chevrolet specs but my numbers don't remotely resemble anything mentioned in that article. The stamped number behind the distributer is AECA2I5392 and the cast number under the GM letters is 839770. Thanks in advance for your help.