Are you serious about 2,000 hp?
Is this a full on race car?
While it is not impossible to make 2,000 hp with a mod motor, I think that is way beyond normal expectations.
You should contact folks such as MMR or John Mihovetz @ Accufab.
At a minimum, a custom sheet metal intake is gonna be necessary.
MMR has these listed on their site.
Hogan Racing Manifolds has some really nice stuff too - Hogan's Racing Manifolds
For my street car, I use a Sullivan intake manifold, but I had to get the ports modified to fit the GT heads. Kris Starnes at Champion in Florida took care of it for me.