Velocity Stacks and Scoops ???

That is large enough to be considered an air horn. Which does the same thing.
about the hoodscoop. It will help a little when its not sealed.. But it will help a LOT (probably that tenth in the quarter) if you seal it.. In your case it should be fairly easy. just make a flat plate that has the center cut out the same size as your stack. then put foam rubber on the edges to get it sealed to the hood. But you might want to replace that piece you cut out of the rear hood reinforcement. just to make a simpler place to seal to. But I would say you could get into the 11.70's with just a sealed hood. because not only would you be getting cold air but also high pressure air. I don't remember what the correlation is but I think it is something like for every 10 degrees you lower the intake air temp you get a 10% increase in power. Or something like that.