Used Ford V8 60 crankshaft for 1937, 1938, 1939.  Small journal, was double slinger; this crank has been modified to use a rope rear main seal similar to the 1940, so will not work well with a labyrinth rear seal.  Main journals at STD, little wear.  Rod journals at -.010, worn up to .004.  Crank has been balanced.  Thrust appears OK.  Would probably clean up and run at STD/-.020.    Ford Part Number 52 6303B