crank casting

Is this a forged or cast unit and is it a small or big block crank?If you can post the main journal size that will tell right away what the crank is,Mrmopartech.
If its a small block:The MJ is 2.50 or smaller for a 318&340.A 360 has a 2.81 MJ.Rod journal is the small for all small blocks,@2.125 for 273,318,340,360.Do you have any idea of what year the motor is,Mrmopartech