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I've found in several cars that the ears on the splash pan that attach to the oil pan bolts are broken away. I suspect, but have no direct proof, that this would be much more likely with rear Float-a-Motors, which allow the engine to flex somewhat. For my '31 I fabricated some reinforcements using 3/16" bar stock about 1-1/2" long and maybe 3/8" wide to go over those flanges (sorry I don't have the exact dimensions, it was a while ago). I had to use oil pan bolts 1/4" longer to go through these new reinforcements. Have not had any issues with the engine pans separating from the oil pan since then. I'll try to get some pictures and add them to this post later today.
UPDATE: photo of my reinforcements. Engine oil pan is up, splash pan is down.