If so I'd call that good for a (20%) 90 cid difference at that level making a 7.5% hp difference and at the street level 410 vs 367 a 12% making a 2% hp difference.
Wonder how much tweaking of cam specs, runner and header lengths maybe port volume etc.. to get to 805 hp.
Where are you getting 2%. Are you cherry picking the point in the curve where the two motors were the closest? Doesn't look like you're using average horsepower.