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stock 440 steel crank ,stock ly rods ,liter pistons could handle 600hp no problem not even working the block.i think if i built a small block that level it would be aftermarket stroker crank possibly steel crank scat rods. that is the price difference.but my 440 build i used scat rods i got off ebay brand new 180.00 dollars.my machinist really had to cut on the crank

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I think at that high level of hp (550-600) and a nearly EQUAL amount of torque, I would be thinking about not reusing the stock reciprocating assembly and get brand new crank/rods from
the factory, MP or Scat. Whether Big Block OR Small Block, after 35-45 years from the assembly line, the original parts do not have 100% shelf
life (tired) and you apply 550-600 hp to them, IMO something's gotta give. It's called putting money in the RIGHT PLACES.