The cork for the front crankshaft pulley bolt hole
BINGO! Hot off the press... Maurice gets the cigar.
... just to add I think this was the best condition cork I ever pulled! I like finding these as it is often a good indication the balancer has never been pulled. As expected, on this 73K mile donor car the nylon teeth on the timing gear was perfectly intact. Another good sign.
Also note the Cadillac Blue engine paint on the end.. They did in deed literally point these engines as an assembly! That is why you see all the original bolts and many attached parts nice and evenly coated blue.