Depends on how much power a person wants to make. I don't think there would be any problem making 800 hp with a 572 inch shortblock and TF270 heads if a person is willing to do some testing. My old 514 made 700 hp when I first put it together with EZ heads. After a couple of years of dyno testing it broke 900 hp. It took us a while to figure out the correct combination of parts but eventually we cracked the code.
I was able to get close to 800 hp with a pump gas 470 that had TF270 heads on it so I think it would be fairly easy to hit 800 hp with a race gas 572. Just need the right cam and a good intake manifold.