A matching numbers car would be a car with all the major castings have the correct casting numbers for that year.Also the date code that the casting was made should agree with the date the car was assembled.
As an example if the car was assembled on May 15th the casting dates would usually be from April of that year, give or take a little.
The Vintage Chevrolet Club does not really consider casting dates.More of a fun club than a high buck car club.The engine casting number could be checked to verify year but dates by month are not checked.Also a 1939 Chevrolet is not a big-buck car-say as a 1957 could be.(I own a 1939).Most are satisified if the engine is of the correct year and it has the original type carburetor,etc.I really wouldn't worry about it being a numbers matching car.
If you post the serial number (on side of cowl under hood) and the Fisher Body numbers (plate of front of firewall), and the engine number stamped into the ledge behind the distributor, we could give you some info. about the car.
