Check one other thing with the crank. See if the rod journal bearing surface have one oil hole in the center or 2 offset to the sides. The crank from the '46-'48 59A motor would usually have just one oil hole because they used a single floating bearing for the 2 rods. If you want to use the 8BA rods and bearings you should use an 8BA crank with the 2 oil holes -- one for each rod bearing.