Your title appears to be using a 1950 passenger engine serial number instead of the number on the data plate you found. Why? Read the tech tip and check your engine serial number.

http://www.stovebolt.com/techtips/VIN.htm

Here is the HAD prefix decoded.

https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/411116#Post411116

Hope this helps.


"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson