IDK, I can tell you by looking at MPH that there ain't many 800 HP big block any things out there.
If you have 800 HP in a 3000 pound car, you are looking at a 9.1x-9.2x deal.
Lots of guys THINK they have *** HP but the MPH says they don't.
And a stock BB at 800 is a small tuning error from being junk. Plus, ring seal is horrendous, bearing life is limited because you can't keep the main line straight in them. It's not as easy as you think.
There are guys with hair dryers that are making good power but the hair dryer is fairly easy on parts. N/A 800 HP is going to kill th block in fairly short order.