First, get a Good Gauge, temporarily plumb it in and see what the oil pressure really is. Doesn't have to be a 0 to 30 lb. gauge like the original, but it does need to be a gauge that can be calibrated and adjusted to a test gauge or dead weight tester or an electronic version (much more readily available today) to insure it's accuracy. You'll likely find pressure is fine.
If you've read this entire thread (and I suspect you have) the first post has the answer you're looking for. Lots of good info above. If you haven't had time to read all the way through, enjoy. Pay particular attention to Hotrod Lincoln when it comes to our old trucks.
Good Luck,
RonR
added in edit: just noticed this is your first post. You should consider making your post a thread of it's own. And then do a hello thread in the Welcome Center.
And WELCOME ABOARD!!
Last edited by moparguy; 01/27/2022 12:03 AM.