I replaced it with another one from an M38A1, it has a reinforcement plate around the mounting bolt holes and appears to be made from thicker steel. Anyway, it's not dripping anymore. I think the old pan will just go in the scrap bin.
I also removed the fuel pump again and cleaned the old gaskets off. I used a file on both sides of the spacer, plus the mounting flange on the fuel pump. Next, I got some fresh gasket paper and made new gaskets and sealed them with my favorite sealer, Permatex Indian Head Gasket Shellac. I also used a little Permatex thread sealant on the mounting bolts.
I let the pump and the transfer case pan sit for a couple of days to allow the sealant to cure before I retorqued the bolts and filled everything with oil. So far, so good.
What a chore for two pesky oil drips!!