It depends on what your expectations are. If for instance judged in concours the condition of the item is supposed to look like new all things being equal. If it doesn't then don't be upset or surprise if there is at least a mention . The deduction if any would depend on how much off the new mark the item in this case glass is from new condition. A new piece of glass with correct trademark but no other issues is not going to get a second look.Date codes are not typically considered unless Thoroughbred or Premier class. FYI in those hardest of classes you would get a deduction if you could tell it was not genuine Ford glass but also a deduction for condition typically if the genuine item didn't look as good as new. Another perspective to consider is if your otherwise completely restored to new condition car that had the majority of things refreshed or replaced already has in it glass that has road rash then that may make sense to you but others it would be seen as a detraction. It is not like you are cutting a lot of originality out of a car that has most all aspects changed already in the case of a restored car and original but not new looking glass. If there was not a lot of acceptable looking alternatives it would be a different story but that is not the case. If it makes you feel better do it but don't expect everyone else to automatically agree. Of course it is your car and your decision is most important for your car.