Need some help identifying a 327 code :-)

[PaPaStewySnipes]

Need some help identifying my engine guys and I know this would be a good place to ask. I have a 72 c15 with a rebuilt 327 in it, truck was sitting for sometime before I bought it. i was told it has a 327, maybe a large journal from a 69 camaro . I have pictures of stamp in front of block by radiator. i was told it was a destroked 350 build. I want to do some work on it and would like to know a bit more about the current set up besides the obvious. In not good with engine codes and asking for help, or if anyone can point me into the correct direction. What year engine model I am dealing with. I3Y148494 T0206GKJ is what I see in that order next to each other left to right. The second set of numbers may end in ckj, I can not tell much.