Some over-thinking going on here. The stock '67 GTO block had chamfers in the wrong place and survived nicely for 55+ years. By the time you bore and deck the block those old chamfers are pretty small, and while they are still there they don't cause a problem.
You get to add new chamfers if you want and the end result will be the same chamfer as a late production '67. As Steve said the most important part of the new chamfer is the top going out to match the head and gasket. And as Chiphead said, the bottom of the chamfer probably not exceeding .200" down in the bore.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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