B Engine stamping

[two4ruff]

I bought a 1969 Roadrunner to fix up and drive. I have no fender tag or build sheet so I'm just making how I'd like it. The engine is a 383 but I'm not sure what some of the stampings next to the distributor means. First are B383 which I suspect means it's a 1966 383. Below are a 5 and a 2 I think that the supposed to mean May 2nd. I also see 2 letter Ks. One K is forward the other is backwards. I can't find anything referencing the KS. Any thoughts?

 

[Lefty71]

Would not be surprised to find its a rebuilders stamping method. When you get it apart, check the dates on the back of the bearing shells.

 

[two4ruff]

I've seen some other comments on builders who have done that. Thanks!