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Well, yea, a solid cam can be stretable no problem, it's more of the duration of any cam that becomes a issue of streetabilty. And about reving to 7,000, not a good idea unless you prep that set up to go there, which makes me wonder, what cam is going to slide in that would be making power at 7.000 rpm? And he considers this streetable?
Waaaaaaaat ever..........
The stock crank can safely go to 550 HP no issue. Going further can be done. I've seen and read 600 hp, but I'd rather have a forged unit if I'm going to build something that stout.