Dodge or plymouth 1969 318

What you provided is a casting number, not decodable by the VIN tool. I'll look at a couple small block motors in the garage tonight, but I do know right off the top of my head that my 1969 Coronet RT has the entire VIN (WS23L9xxxxxxxx) cast right into the block just below the cylinder head on pass side - and the 727 auto trans has the matching VIN cast right on the boss, also as seen on the passenger side. Not sure if the small block cars have the same, but thought they were.