late 70 v-8.
There were "coins" welded to K-members that have two stamped numbers on them, they are the last two digits of the part numbers. Mostly on 70 and up cars.
Example: '70 e-body K-frame numbers
**** *10 - /6 early
2962 012 - 314/340/383 early
2962 014 - HEMI early
3466 477 - 440 early
3583 052 - T/A
**** *70 - /6 late
3583 072 - 318/340/383 late
3583 074 - 440 late
3583 076 - HEMI late
some b'cast sheets indicate 3583 052 - on late (post T/A) 340 4bbl & 383 4bbl cars