The first B1 bracket motor I built and dyno (551 C.I.) made 920 HP with a 1400+ CFM Dam Best carb that was way to rich at WOT on C12 I think, the customer provided the fuel.
That was with the stock B1 cast Dominator intake and right at 13.0 to 1 compression with a World iron block.
I'm in the process of making a 572 C.I. B1 KB aluminum block bracket motor running E85 with a pair of Mark Sullens E85 Dominator carbs flowing around a 1000 CFM each, I'm hoping and shooting for 1000 + HP on pump E85
I may add around 550 HP of NOS to it later for a local No Pep deal