To Glen's point, design decisions are made and what gets delivered is an amalgamation of those decisions. Take the case of Ben's custom hood, diffuser, side skirts and splitter. When the chief engineer for the corvette saw it he wasn't aghast, he really liked it and went out of his way to let Ben know that.
The "purist" and "numbers matching" crowd make me chuckle. Unless you are in your 20's now and plan on keeping the car well into your 50's or 60's you will never live to see the benefit.
Me, I don't plan on owning the car outside of factory warranty so whatever I do will maintain that and hopefully get me a respectable return on the car when I sell it for something new in 2016 or 2017.