It looks like that is a 1950 engine (from a passenger car?):
http://chevy.oldcarmanualproject.com/models/engine.htm#50engDo you have a 1950 Panel Truck or a Panel Wagon (sedan delivery)?
Tiny's advice should be heeded. Also, as Tiny suggested, post a little more information.
1. Do you have an old title?
2. Do you have an old registration?
3. Do you have a vehicle identification plate on the driver's door-jamb?
Also note that the engine number is not necessarily the number that was originally used on a title/registration (but, the engine number seems to have been the most commonly used number/code).