I for one have one of those 400s that started out life as a 350....I elected not to put the arrowhead on the front bumper , for two reasons
not trying the 'clone' my car to say it always was a 400
also , personally I prefer the cleaner look w/o it.
as far as the hockey sticks missing on a car with correct bumper...it does not mean its a fake , necessarily...you need the pHS...the car could have had the grills replaced for some reason, accident or such... PHS is THE way to jusdge a car by