I have seen aftermarket blocks achieve 675 to 700 hp/tq and be street friendly get in and drive engines with EFI. Now running one myself. But man would be something to get a stock block to those numbers. Like the OP said, to 600hp it is doable, but to 700 would take some real voodoo magic I feel.
Get an MR1 or IA2 block if wanting a 700 streetable horse and torque build that will last.
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