Those pictures look like a double notch,but what's the casting number on the back left hand side of the block? Is there a little X on the drivers side,front of the block? If it's a 62,it should have a 962 casting,if it has the x,you have one of the strongest,most desireable 348 blocks that there is.For some reason,I thought that this was a 58-61 5011 truck block.