Finding engine numbers info

How did you come up with '73?
The VIN of the block is listed in post #18 above. Unless there's another one that I missed?

My bad, finger are too fat, it is a 72. The VIN on the block is NOT listed in post 18, that is the casting number on the drivers side of the block. The VIN number is stamped on the PASSENGER side of the block on a 3/4" x 3" ground pad just above the oil pan rail. Here is an example...

VIN location on block.jpg