I don't remember a "Gurney bump" on any Mk II. The '67 MkIV obviously had one, but I've never seen period correct images of a Mk II having a bubble.
FTA:By cross-referencing engine and chassis numbers (clearly visible in period photographs) with racing livery, unique rear bracket shapes and the famous “Gurney bump” on the car's roof, Spain and Teske say they can prove that the car previously thought to be P/1012 -- the car Gurney and Grant drove to second place at Daytona -- was, in fact, car P/1011.
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http://www.autoweek.com/article/20130219/carnews01/130219802#ixzz2LVLa0sHe
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