I recall working on a few older cars where the oils pans always seemed to have "dents" in them at various locations....always assumed these dents were from hitting road debris/thrown rocks/etc...any chance some of those dents were "precision hammer wacks" to give those pans a little clearance here and there?
If it is for clearance, the PO of my '69 also need "clearance" at the left passenger foor well and the gas tank. And by coincidence the sub-frame cross member was packed tight with gravel.