I got my 401M ready to go and fired it up today. Used a donor 305E for the oil pan, filter housing, oil pump, and timing chain cover. New fuel pump, water pump, valve springs, timing chain & sprockets. 650 Edelbrock conversion, new gaskets and paint job. Going to put it in my 62 3/4 ton with a SM 319 overdrive transmission.
https://youtu.be/bIMWFID3Zyk https://youtu.be/L93ftFdgodY Dave