Trying to figure out what the engine code numbers should be on a 1964 Volvo 1800s. The first numbers on the left side of the B18 engine block (drivers side) are: 4968. It is my understanding that the 4968 numbers are generic for a B18 There are two small flat areas of STAMPED numbers next to the 4968 numbers that are very hard to read. Any insight would be much appreciated