1200 hp with a single four cast intake will be a little tough to find. Not sure anyone builds a NA crate engine that hits that number. GM just announced a ZZ632 big block which makes 1000 hp with a cast single four intake. Sounds like a very impressive combo but GM hasn't announced a price yet. You can call Best Machine and Ray Barton to see what those two shops tell you. I don't think you have many options in the Mopar world to hit that number.