it depends on what your definition of 'is', is
by "stock block", i mean that they start with the same casting that the normal cobras ship with, go much over 600 HP with a stock 5.0 block and soon you'll end up with a pretty nice boat anchor...
SHM claims their 800+ HP shortblock is "...the same one used by John Mihovitz...". they don't mention any "filling" though, just the addition of billet rods and oil pump gear and a girdle...of course, just because they don't mention it, don't make it so...
anyway, that's where i got my info.
just parroting what i've read...
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