Not to be a Debbie Downer but I wouldn't think 1000 horsepower worth of N/A flow would even move through a Victor or similar MW head, The general target (within about 10%) rule of thumb for an efficient race engine is Intake port flow is ~4.1 cfm per HP per cylinder. It's not a "end all" formula but it certainly will put you in very close in the ball park as far as N/A head HP potential.
so for a very good but "achievable 380CFM MW head, 380/4.1 ~ 93hp x 8 = 744 HP so maybe (+ 10%) 825 MAX, so how much can a Victor flow at MAX? maybe 400-410? That would be 800 to 880 ish.
So I would expect about 880 hp at most would be the max you could get....without a moved centerline wedge head like a B1. I'd love to see the heads and intake on that puppy if indeed that is the real number. I'm sure the vaccuum pump helps but still that a lot of molecules to burn
a lot depends on the combo. Maxed out 440-1 heads, 15/1 compression, .868 lift roller, methanol fuel injection, thin rings, very good headers, coated pistons, 550cubes, i made 926 hp and track performance was there. But 1,000?
