Remember to clean inside the shafts if you re-use old shafts. FE 352 390 shaft plugs will fit the ends or you can make your own. One more thing.,, Peen over that overflow tube on the end support or plug the hole it goes into! This pressurizes the shaft and raises the oil pressure in the system. The overflow is like a leak on both sides. My 56 800 Ford tractor 172 engine had the same system and my newer Ford manual says to plug it.  Letting the oil squeeze out between the rockers and shaft makes sense to me. 

1957 ________________ Ford

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Y Blocks, The New Flathead!