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The whole "split removal" is shrouded in myth; surely a few were done, one person claimed he'd done dozens (I'm skeptical) and that's just one person. The answer is somewhere in between I'm sure... That same magazine describes how to "mud in" the 63 hood depressions which is equally egregious. Once those puppies are smoothed over its near impossible to dig the crap out and recreate the "double edge" of the 63 depressions necessary to hold the cookie sheets...
I was offered one of those modified hoods for my 63 for cheap and I passed...
In the mid/late 70's, Richard Buxbaum of Classic Motors of Hinsdale bought a lot of cars from a guy in California, George Darrow. One 63 that George sent was a black (repainted horrible blue) 63 coupe that had the split removed. It also had a 4-71 blower sticking through the hood. I still have the VIN somewhere around here.
The car sold to a guy in Detroit who was going to reinstall the split section. I don't know how it turned out.
I remember the ads in the LA Times back then saying something like, "We'll be in Los Angeles next week and buying 50 1963-1967 Corvettes." This went on for years from dealers in the Midwest and East, looking for the usual rust-free CA Vettes.