Decoding Engine and transmission numbers 1970 Dart Swinger 340 4 speed

Speedy D said
The motor ID # is stamped on a machined spot on the front of the engine block just below the drivers side head. This should be a match to your fender tag VIN.

Just a note, the number on the front of the engine is the engine specific serial number for that engine only.

The partial VIN on the block that would match the car VIN if it is still original is down low on the passenger side of the block. ;-)