Depends on the dyno I suppose.
Last similar combo I did was only 434 cubes, but it was 13.5:1 and we ran a *very* light ring pack with a vacuum pump. It made 777 hp. I think I have another camshaft here that I'll try on it when it comes back in for a freshen-up....may be able to get it closer to 800 hp.
We were able to run a Kuntz 460 inch SBF with Yates heads on the dyno here. With a dry sump, it was at 800 hp right on the money.