318 engine identification

Took a break from body work last night and was looking at the 318 i got with my 72. Guy i bought it from said it was out of a 74 pickup. I brushed the crud off the front and got to the numbers stamped under the head. I found a post from KrazyKuda from 2014 that had a chart and was wandering if I'm reading it correctly. Most examples i came across had more numbers for the production code, like if it was the 68th one that day there should be two zeroes there. Just curious.

Also i read on here somewhere that truck motor mounts have 4 bolts and cars had 3. Mine has 3.

HM318R 37361 68

So is this is a 72 318?
Thanks

Engine ID chart.jpg

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