I would have to see a picture to be certain and compare it to my blocks. (I have a few 69 L48 350s)
The clock with the arrow is what hour of the shift the block was cast. Sounds like they are line boring the mains.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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