If you have the small filter, a Fram C100 will work. If you have the large filter I think a Fleetguard LF504 will work. These engines ran 75 years with bypass filters. Drilling and plumbing for a full flow filter doesn't gain a whole lot in my opinion. A full flow filter was not an option on a 270. You have to drill into the oil galley and then return to the oil galley.
