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How much experiance with hydraulic rollers do you actually have?
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Enough to know:
5,800 to 6,200 rpm is "common" for hydraulic roller cam. Anything above that rpm is not "common". There are a few examples, here and there, of high dollar motors equiped with the newest light weight hydraulic valve train components that can do higher. But not many.
Even with a solid roller cam, I'd think twice before I ran a FE style 510 cid to 7,000!
Z06, is not common.
Dedicated drag race motors, are not common.
BBC in Cobras, are not common.
SOHC, is not common.
Can ANYONE post an example of a 500+ cid FE style motor (Shelby, Dove, Side Oiler, etc.) spinning 7,000 rpm with HYDRAULIC ROLLERS? If so, that is one RARE motor (and KC built it). 
The original question was: Can BLITZ turn 7,000 with his 510 cid KC motor? The answer depends on several variables, but the cam is the big one. It's not likely with a hydraulic roller and that cid.