Engine Decode?

If it were a small block Chevy I'd know tons of places online to decode it but being a Mopar newbie I don't know of any. Can anyone give me a link or help me out with these numbers?

I know it's a 318 but other than that, it could have come out of anything from any year.

The stamp on the drivers side of the block says, 6 5M318 and further down it says, C (but the C is stamped backwards) 9030298. The casting number on the heads are 3769973. The valve sizes on the heads are approx 1.88 intake and 1.62 exhaust. I only had a tape measure to check them with so I'm sure the real size will be a bit different. Thanks in advance for any help I can get in figuring out some of the details on this 318.

Regards
Red