Check this out. The 356 I have in the Duchess is a 47-48 356, as it would be for your engine.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=5878&viewmode=flat&order=ASC&type=&mode=0&start=50 POST 53. Good clear picture of A correct way to do it, which I did with much help and patience from several people here. The earlier pictures in my blog show it incorrectly plumbed.
Note that some filters have the outlet on top and some have the outlet on the bottom. As I was advised: use a mirror to look under the filter for the stamped word Outlet (or Inlet). Mine was originally plumbed by a very knowledgeable Packard engine rebuilder and machinist, backwards. A little trick Packard played on mechanics, I guess. The 40s flow is opposite to later years. We plumbed it backwards because we were focusing on making the modifications recommended in the Service Letter to send more and cleaner oil to the hydraulic lifters, which were new in 1940.
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