Iv been cleaning and putting back together my olds 394 over this week since it back from the machine shop. After the plugs were removed they put in most new ones except for 2 coolant plugs and a unknown small one. It's not an oil Gallery plug since they are all in the block. Does anyone know or know all known plug locations?

 

looks like 2 drain plugs for the sides of the block,and one for a vacuum hole or oil line

 

Found this picture on E-bay