And if your looking for block casting numbers they should be on the right side of the block. Duane mentioned where to find them on the heads. The 5J22 is probably the head's date code. 65/Sept/22nd decodes that and they would be located between the center two valve springs on the head. The block will have a date code similar to that below the oil filter adapter area. Lots of the FE blocks have the same casting numbers for different bores so you might have to measure the cyl bore to figure which it is. So let us know what you find....

G.