Keith, Wayne, Dennis and Don - yes, there would be a deduction if the plate is missing. There would be no deduction if "slightly" oversized fasteners were used as long as they have the correct head stamping and shape. In my view IH generally did not add something to the tractor they didn't think was necessary, and they didn't leave something off they thought was necessary (except maybe the early hydro by-pass tube loop and metal fan with shroud).
Paul - I really have no issue with your sign or your feelings about restorations, refurb, etc. It's actually nice to know someone knows "what is, and what is not correct". I actually appreciate your participation, and especially your knowledge of IH Cub Cadet details, history and facts. The problem I have with many people is that they "think" they know what is correct. I actually like to see alot of the improved items, as long as it is actually improved. I have no issue with Don T using many improved items. I DO have a problem with some guy that uses a cheap $3 front wheel bearing so you can drive the tractor around, buy it, and get it home only to have it fail, then call the guy and him tell you - oh just go buy another $3 bearing - ooh, and it's just to bad the bearing scored the spindle and that will cost you $80.
Overall, I don't consider myself a member of the Correct Police even tho many probably think I am. When I look for 100 point tractors it tells me who ever did it at least attempted to do it correctly, and took pride in what they were doing. Here's a pic of a decal that was included on some Cub Cadets (actually from CCC). When I found it I started to include it on every Cub Cadet I restored or refurbed. I have one on my 169. It's not the best pic and I didn't count the stars, but it certainly says it like it is or was.