Here are some more photos after coming out of the hot tank.
There is a clearly visible (MA) crayon mark on the block. The (A) doesn't have a slash on it though and I think that maybe it should be an (N) because my car is an MN code?? Have you guys seen this before? I have not read about it in Ed's book nor Mcneish's. Is this a known marking or did I just discover it?
l72 bare block/crayon