Is there any info on what the various stampings on the Prestolite distributors mean? Code book.

Interested in the 60-70 Dual Points primarily. What does IBS mean versus IBB or IBP, how can you tell what the cam stop stamps mean. Example B LU.

I understand the basics and more like CW and CCW rotation, shaft lengths, and I have cross referenced the Mopar parts books looking at common parts and where parts change, but I have noticed some differences in breaker plates as an example and height of the distributor body.

Can't find any period type Prestolite documents on line to figure it out, so looking to see if any help here. Thanks in advance.