engine identification

I have motor out of car on stand with heads off. re-assembling. car is 1974 dart sport. I will need to get the vin off the right side of block so I can see what it came out of.. date is 5/6/70 so assembled in june makes sense.original crank is long gone. The crank in it looks to be 318 new replacement when rebuilt in the mid or early 80's. Thanks everyone for info!