In regard to the above statement on the 1 looking like an I and the 7 I’m going to post a 71 hemi super bee block for reference with that same font. Also there are several cases where the factory hand stamped the vin on a block, and the gang stamp was not used I assume not to stall production when an issue came up. When you get into studying vin stamping several things make a difference, such as assembly plant, time frame of the build, ext. I have even seen some vins be stamp totally above the machine surface, into the raw casting area.
Matt