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Looks like the crankcase breather is missing
That does not seem to be correct. The breather would come from the valve cover, IMO, at least on a 2H.
This seems to be lower, and on the block, not in the head. there could be a freeze plug there that came out. if so, don't drive the truck. yes, if it is a freeze plug you can thread the hole and put a plug in there.