Engine Block Code

Okay, I had a 318 given to me. The block is clearly stamped 318, but with a block code that I think reads 2506080. Does this code mean anything or is this the production number? I ask because it has a four barrel intake on it. It's a factory chrysler intake but almost looks to big for the 318. The other side I believe has a date code. Like 3-24-72. I'm guessing that's the production date. Can anyone point me where to look or does the block code not mean anything for heads and intake?