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Plumb it as original, as suggested by Terry Ohio. It sounds like you have a nice old original survivor. The oil filters back in the day weren't all that efficient in the first place. Just change oil and then change the oil regularly. It has survived for 85 years without a filter, it should work just fine without one for many years to come. If you want a firewall spin on filter, get a modern car. Stick with era technology. My 2¢.