That appears to be all the numbers.
F 530-6 3338
KHK
It does have the 5 freeze plugs on the left though.
The following is on the R/H, front side, stamped next to the deck next to the cylinder head: 9225R 2 15 CE
Further checking shows a cast...
I've searched a lot of sites and am stumped. The engine is definitely not from my 74 valiant and appears to be newer than 75. The 2 casting #'s I see on the block are 3338 and 530-6. The also appears to be a letter "F" as well. I am lost on this one, I appreciate any information.