The picture of the engine with 400 original miles on it DOES appear to be a medium grey color, I note too that it is the same matte finish as the dark grey I have seen and the "blue-grey" that we seem to have kind of figured out.

Maybe this IS an exercise in finding a standard which simply is NOT a standard at all.

I really want to follow the pattern of what I have seen personally. I am thinking I will do my '55 235 in dark grey and my eventual 261 dressed as a 216 in the bluegrey color LOL. And I will use a dullcoat over the paint too!