Looking to buy/build 500-600 fwhp 360

Can a stock block handle 600 to 700 hp ?

That is a good question. I am shooting for 500-600. Altitude has something to do with it, and I am at 3300 ft which reduces the HP about 10 percent. So I will have about 550 HP max at my elevation. It's pushing the strength of the block at this level, I am sure.