If the number is not on the smooth pad just below the head above the starter did you also check around the area of the distributor? On pre 51 blocks number could have been stamped on the rough casting at either side of the distributor. The roughness of the block and with sometimes very faint stampings covered with dirt and grease, the numbers can be hard to see.
Here is a photo of one position but while still in the general area, location seemed to have varied a bit between years. When you find the number check out the engine serial number list
https://www.packardinfo.com/xoops/html/downloads/PackardEngineSerials.pdf to find the exact engine.
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