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I would call the manufacturer your going to use and see what measurement they use. My guess would be ball end to inside cup. Your method is right on, don't worry about what summit has listed. It could be the difference between rocker setups, gaskets, deck thickness, etc.

looks like what a buddy of mine did one time, thought he pulled all the head bolts and went ahead with a chisel in between the head and block. started smacking it with a BFH then he heard a cracking sound. pulled the head and it still had part of the block bolted to the head!