Be aware that there are several types of oil pans that fit this block. The truck type with rear sump was mentioned. The Ford car type has a center sump pan style, and the Mercury cars have a rear sump type that is shorter than the pick up type. There are other ones in the later 50s cars/pickups but they aren't too much different with exception to the long sump 53 pickup type. It depends on what you want the motor to fit into as to the choice you make.